21198975

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{149}}^1\times {\mathrm{271}}^1$

素因数の和:440

約数の個数: 48

約数和(自身を含む): 40473600

約数和(自身を除く): 19274625

約数列:

[1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 149, 175, 271, 447, 525, 745, 813, 1043, 1355, 1897, 2235, 3129, 3725, 4065, 5215, 5691, 6775, 9485, 11175, 15645, 20325, 26075, 28455, 40379, 47425, 78225, 121137, 142275, 201895, 282653, 605685, 847959, 1009475, 1413265, 3028425, 4239795, 7066325, 21198975]

約数ペア:

[(1, 21198975), (3, 7066325), (5, 4239795), (7, 3028425), (15, 1413265), (21, 1009475), (25, 847959), (35, 605685), (75, 282653), (105, 201895), (149, 142275), (175, 121137), (271, 78225), (447, 47425), (525, 40379), (745, 28455), (813, 26075), (1043, 20325), (1355, 15645), (1897, 11175), (2235, 9485), (3129, 6775), (3725, 5691), (4065, 5215)]