21356912

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{163}}^1\times {\mathrm{431}}^1$

素因数の和:621

約数の個数: 40

約数和(自身を含む): 43925760

約数和(自身を除く): 22568848

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 163, 304, 326, 431, 652, 862, 1304, 1724, 2608, 3097, 3448, 6194, 6896, 8189, 12388, 16378, 24776, 32756, 49552, 65512, 70253, 131024, 140506, 281012, 562024, 1124048, 1334807, 2669614, 5339228, 10678456, 21356912]

約数ペア:

[(1, 21356912), (2, 10678456), (4, 5339228), (8, 2669614), (16, 1334807), (19, 1124048), (38, 562024), (76, 281012), (152, 140506), (163, 131024), (304, 70253), (326, 65512), (431, 49552), (652, 32756), (862, 24776), (1304, 16378), (1724, 12388), (2608, 8189), (3097, 6896), (3448, 6194)]