21720279

素因数分解:

$3^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{1063}}^1$

素因数の和:1219

約数の個数: 24

約数和(自身を含む): 33962880

約数和(自身を除く): 12242601

約数列:

[1, 3, 7, 21, 49, 139, 147, 417, 973, 1063, 2919, 3189, 6811, 7441, 20433, 22323, 52087, 147757, 156261, 443271, 1034299, 3102897, 7240093, 21720279]

約数ペア:

[(1, 21720279), (3, 7240093), (7, 3102897), (21, 1034299), (49, 443271), (139, 156261), (147, 147757), (417, 52087), (973, 22323), (1063, 20433), (2919, 7441), (3189, 6811)]