21487860

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1$

素因数の和:198

約数の個数: 144

約数和(自身を含む): 70412160

約数和(自身を除く): 48924300

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 30, 36, 38, 45, 57, 60, 61, 76, 90, 95, 103, 114, 122, 171, 180, 183, 190, 206, 228, 244, 285, 305, 309, 342, 366, 380, 412, 515, 549, 570, 610, 618, 684, 732, 855, 915, 927, 1030, 1098, 1140, 1159, 1220, 1236, 1545, 1710, 1830, 1854, 1957, 2060, 2196, 2318, 2745, 3090, 3420, 3477, 3660, 3708, 3914, 4635, 4636, 5490, 5795, 5871, 6180, 6283, 6954, 7828, 9270, 9785, 10431, 10980, 11590, 11742, 12566, 13908, 17385, 17613, 18540, 18849, 19570, 20862, 23180, 23484, 25132, 29355, 31415, 34770, 35226, 37698, 39140, 41724, 52155, 56547, 58710, 62830, 69540, 70452, 75396, 88065, 94245, 104310, 113094, 117420, 119377, 125660, 176130, 188490, 208620, 226188, 238754, 282735, 352260, 358131, 376980, 477508, 565470, 596885, 716262, 1074393, 1130940, 1193770, 1432524, 1790655, 2148786, 2387540, 3581310, 4297572, 5371965, 7162620, 10743930, 21487860]

約数ペア:

[(1, 21487860), (2, 10743930), (3, 7162620), (4, 5371965), (5, 4297572), (6, 3581310), (9, 2387540), (10, 2148786), (12, 1790655), (15, 1432524), (18, 1193770), (19, 1130940), (20, 1074393), (30, 716262), (36, 596885), (38, 565470), (45, 477508), (57, 376980), (60, 358131), (61, 352260), (76, 282735), (90, 238754), (95, 226188), (103, 208620), (114, 188490), (122, 176130), (171, 125660), (180, 119377), (183, 117420), (190, 113094), (206, 104310), (228, 94245), (244, 88065), (285, 75396), (305, 70452), (309, 69540), (342, 62830), (366, 58710), (380, 56547), (412, 52155), (515, 41724), (549, 39140), (570, 37698), (610, 35226), (618, 34770), (684, 31415), (732, 29355), (855, 25132), (915, 23484), (927, 23180), (1030, 20862), (1098, 19570), (1140, 18849), (1159, 18540), (1220, 17613), (1236, 17385), (1545, 13908), (1710, 12566), (1830, 11742), (1854, 11590), (1957, 10980), (2060, 10431), (2196, 9785), (2318, 9270), (2745, 7828), (3090, 6954), (3420, 6283), (3477, 6180), (3660, 5871), (3708, 5795), (3914, 5490), (4635, 4636)]