21378420

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{47}}^1$

素因数の和:107

約数の個数: 216

約数和(自身を含む): 79881984

約数和(自身を除く): 58503564

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 19, 20, 21, 28, 30, 35, 36, 38, 42, 45, 47, 57, 60, 63, 70, 76, 84, 90, 94, 95, 105, 114, 126, 133, 140, 141, 171, 180, 188, 190, 210, 228, 235, 252, 266, 282, 285, 315, 329, 342, 361, 380, 399, 420, 423, 470, 532, 564, 570, 630, 658, 665, 684, 705, 722, 798, 846, 855, 893, 940, 987, 1083, 1140, 1197, 1260, 1316, 1330, 1410, 1444, 1596, 1645, 1692, 1710, 1786, 1805, 1974, 1995, 2115, 2166, 2394, 2527, 2660, 2679, 2820, 2961, 3249, 3290, 3420, 3572, 3610, 3948, 3990, 4230, 4332, 4465, 4788, 4935, 5054, 5358, 5415, 5922, 5985, 6251, 6498, 6580, 7220, 7581, 7980, 8037, 8460, 8930, 9870, 10108, 10716, 10830, 11844, 11970, 12502, 12635, 12996, 13395, 14805, 15162, 16074, 16245, 16967, 17860, 18753, 19740, 21660, 22743, 23940, 25004, 25270, 26790, 29610, 30324, 31255, 32148, 32490, 33934, 37506, 37905, 40185, 45486, 50540, 50901, 53580, 56259, 59220, 62510, 64980, 67868, 75012, 75810, 80370, 84835, 90972, 93765, 101802, 112518, 113715, 118769, 125020, 151620, 152703, 160740, 169670, 187530, 203604, 225036, 227430, 237538, 254505, 281295, 305406, 339340, 356307, 375060, 454860, 475076, 509010, 562590, 593845, 610812, 712614, 763515, 1018020, 1068921, 1125180, 1187690, 1425228, 1527030, 1781535, 2137842, 2375380, 3054060, 3563070, 4275684, 5344605, 7126140, 10689210, 21378420]

約数ペア:

[(1, 21378420), (2, 10689210), (3, 7126140), (4, 5344605), (5, 4275684), (6, 3563070), (7, 3054060), (9, 2375380), (10, 2137842), (12, 1781535), (14, 1527030), (15, 1425228), (18, 1187690), (19, 1125180), (20, 1068921), (21, 1018020), (28, 763515), (30, 712614), (35, 610812), (36, 593845), (38, 562590), (42, 509010), (45, 475076), (47, 454860), (57, 375060), (60, 356307), (63, 339340), (70, 305406), (76, 281295), (84, 254505), (90, 237538), (94, 227430), (95, 225036), (105, 203604), (114, 187530), (126, 169670), (133, 160740), (140, 152703), (141, 151620), (171, 125020), (180, 118769), (188, 113715), (190, 112518), (210, 101802), (228, 93765), (235, 90972), (252, 84835), (266, 80370), (282, 75810), (285, 75012), (315, 67868), (329, 64980), (342, 62510), (361, 59220), (380, 56259), (399, 53580), (420, 50901), (423, 50540), (470, 45486), (532, 40185), (564, 37905), (570, 37506), (630, 33934), (658, 32490), (665, 32148), (684, 31255), (705, 30324), (722, 29610), (798, 26790), (846, 25270), (855, 25004), (893, 23940), (940, 22743), (987, 21660), (1083, 19740), (1140, 18753), (1197, 17860), (1260, 16967), (1316, 16245), (1330, 16074), (1410, 15162), (1444, 14805), (1596, 13395), (1645, 12996), (1692, 12635), (1710, 12502), (1786, 11970), (1805, 11844), (1974, 10830), (1995, 10716), (2115, 10108), (2166, 9870), (2394, 8930), (2527, 8460), (2660, 8037), (2679, 7980), (2820, 7581), (2961, 7220), (3249, 6580), (3290, 6498), (3420, 6251), (3572, 5985), (3610, 5922), (3948, 5415), (3990, 5358), (4230, 5054), (4332, 4935), (4465, 4788)]