21262381

素因数分解:

$7^1\times {\mathrm{53}}^1\times {\mathrm{223}}^1\times {\mathrm{257}}^1$

素因数の和:540

約数の個数: 16

約数和(自身を含む): 24966144

約数和(自身を除く): 3703763

約数列:

[1, 7, 53, 223, 257, 371, 1561, 1799, 11819, 13621, 57311, 82733, 95347, 401177, 3037483, 21262381]

約数ペア:

[(1, 21262381), (7, 3037483), (53, 401177), (223, 95347), (257, 82733), (371, 57311), (1561, 13621), (1799, 11819)]