21493940

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^2\times {\mathrm{229}}^1$

素因数の和:289

約数の個数: 72

約数和(自身を含む): 51526440

約数和(自身を除く): 30032500

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 190, 229, 247, 260, 361, 380, 458, 494, 722, 916, 988, 1145, 1235, 1444, 1805, 2290, 2470, 2977, 3610, 4351, 4580, 4693, 4940, 5954, 7220, 8702, 9386, 11908, 14885, 17404, 18772, 21755, 23465, 29770, 43510, 46930, 56563, 59540, 82669, 87020, 93860, 113126, 165338, 226252, 282815, 330676, 413345, 565630, 826690, 1074697, 1131260, 1653380, 2149394, 4298788, 5373485, 10746970, 21493940]

約数ペア:

[(1, 21493940), (2, 10746970), (4, 5373485), (5, 4298788), (10, 2149394), (13, 1653380), (19, 1131260), (20, 1074697), (26, 826690), (38, 565630), (52, 413345), (65, 330676), (76, 282815), (95, 226252), (130, 165338), (190, 113126), (229, 93860), (247, 87020), (260, 82669), (361, 59540), (380, 56563), (458, 46930), (494, 43510), (722, 29770), (916, 23465), (988, 21755), (1145, 18772), (1235, 17404), (1444, 14885), (1805, 11908), (2290, 9386), (2470, 8702), (2977, 7220), (3610, 5954), (4351, 4940), (4580, 4693)]