21391210

素因数分解:

$2^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{49747}}^1$

素因数の和:49797

約数の個数: 16

約数和(自身を含む): 39400416

約数和(自身を除く): 18009206

約数列:

[1, 2, 5, 10, 43, 86, 215, 430, 49747, 99494, 248735, 497470, 2139121, 4278242, 10695605, 21391210]

約数ペア:

[(1, 21391210), (2, 10695605), (5, 4278242), (10, 2139121), (43, 497470), (86, 248735), (215, 99494), (430, 49747)]