20721560

素因数分解:

$2^3\times 5^1\times {\mathrm{701}}^1\times {\mathrm{739}}^1$

素因数の和:1451

約数の個数: 32

約数和(自身を含む): 46753200

約数和(自身を除く): 26031640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 701, 739, 1402, 1478, 2804, 2956, 3505, 3695, 5608, 5912, 7010, 7390, 14020, 14780, 28040, 29560, 518039, 1036078, 2072156, 2590195, 4144312, 5180390, 10360780, 20721560]

約数ペア:

[(1, 20721560), (2, 10360780), (4, 5180390), (5, 4144312), (8, 2590195), (10, 2072156), (20, 1036078), (40, 518039), (701, 29560), (739, 28040), (1402, 14780), (1478, 14020), (2804, 7390), (2956, 7010), (3505, 5912), (3695, 5608)]