20512821

素因数分解:

$3^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{2969}}^1$

素因数の和:3033

約数の個数: 24

約数和(自身を含む): 32503680

約数和(自身を除く): 11990859

約数列:

[1, 3, 7, 21, 47, 49, 141, 147, 329, 987, 2303, 2969, 6909, 8907, 20783, 62349, 139543, 145481, 418629, 436443, 976801, 2930403, 6837607, 20512821]

約数ペア:

[(1, 20512821), (3, 6837607), (7, 2930403), (21, 976801), (47, 436443), (49, 418629), (141, 145481), (147, 139543), (329, 62349), (987, 20783), (2303, 8907), (2969, 6909)]