21516781

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{167}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 27433728

約数和(自身を除く): 5916947

約数列:

[1, 11, 13, 17, 53, 143, 167, 187, 221, 583, 689, 901, 1837, 2171, 2431, 2839, 7579, 8851, 9911, 11713, 23881, 31229, 36907, 97361, 115063, 128843, 150467, 405977, 1265693, 1655137, 1956071, 21516781]

約数ペア:

[(1, 21516781), (11, 1956071), (13, 1655137), (17, 1265693), (53, 405977), (143, 150467), (167, 128843), (187, 115063), (221, 97361), (583, 36907), (689, 31229), (901, 23881), (1837, 11713), (2171, 9911), (2431, 8851), (2839, 7579)]