21366915

素因数分解:

$3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{157}}^1\times {\mathrm{211}}^1$

素因数の和:419

約数の個数: 32

約数和(自身を含む): 35371776

約数和(自身を除く): 14004861

約数列:

[1, 3, 5, 15, 43, 129, 157, 211, 215, 471, 633, 645, 785, 1055, 2355, 3165, 6751, 9073, 20253, 27219, 33127, 33755, 45365, 99381, 101265, 136095, 165635, 496905, 1424461, 4273383, 7122305, 21366915]

約数ペア:

[(1, 21366915), (3, 7122305), (5, 4273383), (15, 1424461), (43, 496905), (129, 165635), (157, 136095), (211, 101265), (215, 99381), (471, 45365), (633, 33755), (645, 33127), (785, 27219), (1055, 20253), (2355, 9073), (3165, 6751)]