21391895

素因数分解:

$5^1\times 7^1\times {\mathrm{97}}^1\times {\mathrm{6301}}^1$

素因数の和:6410

約数の個数: 16

約数和(自身を含む): 29644608

約数和(自身を除く): 8252713

約数列:

[1, 5, 7, 35, 97, 485, 679, 3395, 6301, 31505, 44107, 220535, 611197, 3055985, 4278379, 21391895]

約数ペア:

[(1, 21391895), (5, 4278379), (7, 3055985), (35, 611197), (97, 220535), (485, 44107), (679, 31505), (3395, 6301)]