21281775

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{6599}}^1$

素因数の和:6655

約数の個数: 24

約数和(自身を含む): 36009600

約数和(自身を除く): 14727825

約数列:

[1, 3, 5, 15, 25, 43, 75, 129, 215, 645, 1075, 3225, 6599, 19797, 32995, 98985, 164975, 283757, 494925, 851271, 1418785, 4256355, 7093925, 21281775]

約数ペア:

[(1, 21281775), (3, 7093925), (5, 4256355), (15, 1418785), (25, 851271), (43, 494925), (75, 283757), (129, 164975), (215, 98985), (645, 32995), (1075, 19797), (3225, 6599)]