21315975

素因数分解:

$3^1\times 5^2\times {\mathrm{71}}^1\times {\mathrm{4003}}^1$

素因数の和:4087

約数の個数: 24

約数和(自身を含む): 35747712

約数和(自身を除く): 14431737

約数列:

[1, 3, 5, 15, 25, 71, 75, 213, 355, 1065, 1775, 4003, 5325, 12009, 20015, 60045, 100075, 284213, 300225, 852639, 1421065, 4263195, 7105325, 21315975]

約数ペア:

[(1, 21315975), (3, 7105325), (5, 4263195), (15, 1421065), (25, 852639), (71, 300225), (75, 284213), (213, 100075), (355, 60045), (1065, 20015), (1775, 12009), (4003, 5325)]