21408320

素因数分解:

$2^6\times 5^1\times {\mathrm{149}}^1\times {\mathrm{449}}^1$

素因数の和:615

約数の個数: 56

約数和(自身を含む): 51435000

約数和(自身を除く): 30026680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 149, 160, 298, 320, 449, 596, 745, 898, 1192, 1490, 1796, 2245, 2384, 2980, 3592, 4490, 4768, 5960, 7184, 8980, 9536, 11920, 14368, 17960, 23840, 28736, 35920, 47680, 66901, 71840, 133802, 143680, 267604, 334505, 535208, 669010, 1070416, 1338020, 2140832, 2676040, 4281664, 5352080, 10704160, 21408320]

約数ペア:

[(1, 21408320), (2, 10704160), (4, 5352080), (5, 4281664), (8, 2676040), (10, 2140832), (16, 1338020), (20, 1070416), (32, 669010), (40, 535208), (64, 334505), (80, 267604), (149, 143680), (160, 133802), (298, 71840), (320, 66901), (449, 47680), (596, 35920), (745, 28736), (898, 23840), (1192, 17960), (1490, 14368), (1796, 11920), (2245, 9536), (2384, 8980), (2980, 7184), (3592, 5960), (4490, 4768)]