21207420

素因数分解:

$2^2\times 3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1$

素因数の和:106

約数の個数: 240

約数和(自身を含む): 76839840

約数和(自身を除く): 55632420

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 13, 15, 18, 19, 20, 26, 27, 30, 36, 38, 39, 45, 52, 53, 54, 57, 60, 65, 76, 78, 81, 90, 95, 106, 108, 114, 117, 130, 135, 156, 159, 162, 171, 180, 190, 195, 212, 228, 234, 247, 260, 265, 270, 285, 318, 324, 342, 351, 380, 390, 405, 468, 477, 494, 513, 530, 540, 570, 585, 636, 684, 689, 702, 741, 780, 795, 810, 855, 954, 988, 1007, 1026, 1053, 1060, 1140, 1170, 1235, 1378, 1404, 1431, 1482, 1539, 1590, 1620, 1710, 1755, 1908, 2014, 2052, 2067, 2106, 2223, 2340, 2385, 2470, 2565, 2756, 2862, 2964, 3021, 3078, 3180, 3420, 3445, 3510, 3705, 4028, 4134, 4212, 4293, 4446, 4770, 4940, 5035, 5130, 5265, 5724, 6042, 6156, 6201, 6669, 6890, 7020, 7155, 7410, 7695, 8268, 8586, 8892, 9063, 9540, 10070, 10260, 10335, 10530, 11115, 12084, 12402, 13091, 13338, 13780, 14310, 14820, 15105, 15390, 17172, 18126, 18603, 20007, 20140, 20670, 21060, 21465, 22230, 24804, 26182, 26676, 27189, 28620, 30210, 30780, 31005, 33345, 36252, 37206, 39273, 40014, 41340, 42930, 44460, 45315, 52364, 54378, 55809, 60420, 62010, 65455, 66690, 74412, 78546, 80028, 81567, 85860, 90630, 93015, 100035, 108756, 111618, 117819, 124020, 130910, 133380, 135945, 157092, 163134, 181260, 186030, 196365, 200070, 223236, 235638, 261820, 271890, 279045, 326268, 353457, 372060, 392730, 400140, 407835, 471276, 543780, 558090, 589095, 706914, 785460, 815670, 1060371, 1116180, 1178190, 1413828, 1631340, 1767285, 2120742, 2356380, 3534570, 4241484, 5301855, 7069140, 10603710, 21207420]

約数ペア:

[(1, 21207420), (2, 10603710), (3, 7069140), (4, 5301855), (5, 4241484), (6, 3534570), (9, 2356380), (10, 2120742), (12, 1767285), (13, 1631340), (15, 1413828), (18, 1178190), (19, 1116180), (20, 1060371), (26, 815670), (27, 785460), (30, 706914), (36, 589095), (38, 558090), (39, 543780), (45, 471276), (52, 407835), (53, 400140), (54, 392730), (57, 372060), (60, 353457), (65, 326268), (76, 279045), (78, 271890), (81, 261820), (90, 235638), (95, 223236), (106, 200070), (108, 196365), (114, 186030), (117, 181260), (130, 163134), (135, 157092), (156, 135945), (159, 133380), (162, 130910), (171, 124020), (180, 117819), (190, 111618), (195, 108756), (212, 100035), (228, 93015), (234, 90630), (247, 85860), (260, 81567), (265, 80028), (270, 78546), (285, 74412), (318, 66690), (324, 65455), (342, 62010), (351, 60420), (380, 55809), (390, 54378), (405, 52364), (468, 45315), (477, 44460), (494, 42930), (513, 41340), (530, 40014), (540, 39273), (570, 37206), (585, 36252), (636, 33345), (684, 31005), (689, 30780), (702, 30210), (741, 28620), (780, 27189), (795, 26676), (810, 26182), (855, 24804), (954, 22230), (988, 21465), (1007, 21060), (1026, 20670), (1053, 20140), (1060, 20007), (1140, 18603), (1170, 18126), (1235, 17172), (1378, 15390), (1404, 15105), (1431, 14820), (1482, 14310), (1539, 13780), (1590, 13338), (1620, 13091), (1710, 12402), (1755, 12084), (1908, 11115), (2014, 10530), (2052, 10335), (2067, 10260), (2106, 10070), (2223, 9540), (2340, 9063), (2385, 8892), (2470, 8586), (2565, 8268), (2756, 7695), (2862, 7410), (2964, 7155), (3021, 7020), (3078, 6890), (3180, 6669), (3420, 6201), (3445, 6156), (3510, 6042), (3705, 5724), (4028, 5265), (4134, 5130), (4212, 5035), (4293, 4940), (4446, 4770)]