21405993

素因数分解:

$3^1\times 7^2\times {\mathrm{223}}^1\times {\mathrm{653}}^1$

素因数の和:893

約数の個数: 24

約数和(自身を含む): 33401088

約数和(自身を除く): 11995095

約数列:

[1, 3, 7, 21, 49, 147, 223, 653, 669, 1561, 1959, 4571, 4683, 10927, 13713, 31997, 32781, 95991, 145619, 436857, 1019333, 3057999, 7135331, 21405993]

約数ペア:

[(1, 21405993), (3, 7135331), (7, 3057999), (21, 1019333), (49, 436857), (147, 145619), (223, 95991), (653, 32781), (669, 31997), (1561, 13713), (1959, 10927), (4571, 4683)]