21108440

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{211}}^1$

素因数の和:324

約数の個数: 64

約数和(自身を含む): 49684320

約数和(自身を除く): 28575880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 61, 82, 122, 164, 205, 211, 244, 305, 328, 410, 422, 488, 610, 820, 844, 1055, 1220, 1640, 1688, 2110, 2440, 2501, 4220, 5002, 8440, 8651, 10004, 12505, 12871, 17302, 20008, 25010, 25742, 34604, 43255, 50020, 51484, 64355, 69208, 86510, 100040, 102968, 128710, 173020, 257420, 346040, 514840, 527711, 1055422, 2110844, 2638555, 4221688, 5277110, 10554220, 21108440]

約数ペア:

[(1, 21108440), (2, 10554220), (4, 5277110), (5, 4221688), (8, 2638555), (10, 2110844), (20, 1055422), (40, 527711), (41, 514840), (61, 346040), (82, 257420), (122, 173020), (164, 128710), (205, 102968), (211, 100040), (244, 86510), (305, 69208), (328, 64355), (410, 51484), (422, 50020), (488, 43255), (610, 34604), (820, 25742), (844, 25010), (1055, 20008), (1220, 17302), (1640, 12871), (1688, 12505), (2110, 10004), (2440, 8651), (2501, 8440), (4220, 5002)]