21990171

素因数分解:

$3^1\times 7^2\times {\mathrm{227}}^1\times {\mathrm{659}}^1$

素因数の和:903

約数の個数: 24

約数和(自身を含む): 34309440

約数和(自身を除く): 12319269

約数列:

[1, 3, 7, 21, 49, 147, 227, 659, 681, 1589, 1977, 4613, 4767, 11123, 13839, 32291, 33369, 96873, 149593, 448779, 1047151, 3141453, 7330057, 21990171]

約数ペア:

[(1, 21990171), (3, 7330057), (7, 3141453), (21, 1047151), (49, 448779), (147, 149593), (227, 96873), (659, 33369), (681, 32291), (1589, 13839), (1977, 11123), (4613, 4767)]