21289919

素因数分解:

$7^1\times {\mathrm{47}}^1\times {\mathrm{163}}^1\times {\mathrm{397}}^1$

素因数の和:614

約数の個数: 16

約数和(自身を含む): 25064448

約数和(自身を除く): 3774529

約数列:

[1, 7, 47, 163, 329, 397, 1141, 2779, 7661, 18659, 53627, 64711, 130613, 452977, 3041417, 21289919]

約数ペア:

[(1, 21289919), (7, 3041417), (47, 452977), (163, 130613), (329, 64711), (397, 53627), (1141, 18659), (2779, 7661)]