21115227

素因数分解:

$3^1\times 7^2\times {\mathrm{379}}^2$

素因数の和:775

約数の個数: 18

約数和(自身を含む): 32836788

約数和(自身を除く): 11721561

約数列:

[1, 3, 7, 21, 49, 147, 379, 1137, 2653, 7959, 18571, 55713, 143641, 430923, 1005487, 3016461, 7038409, 21115227]

約数ペア:

[(1, 21115227), (3, 7038409), (7, 3016461), (21, 1005487), (49, 430923), (147, 143641), (379, 55713), (1137, 18571), (2653, 7959)]