21278480

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{13999}}^1$

素因数の和:14031

約数の個数: 40

約数和(自身を含む): 52080000

約数和(自身を除く): 30801520

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760, 1520, 13999, 27998, 55996, 69995, 111992, 139990, 223984, 265981, 279980, 531962, 559960, 1063924, 1119920, 1329905, 2127848, 2659810, 4255696, 5319620, 10639240, 21278480]

約数ペア:

[(1, 21278480), (2, 10639240), (4, 5319620), (5, 4255696), (8, 2659810), (10, 2127848), (16, 1329905), (19, 1119920), (20, 1063924), (38, 559960), (40, 531962), (76, 279980), (80, 265981), (95, 223984), (152, 139990), (190, 111992), (304, 69995), (380, 55996), (760, 27998), (1520, 13999)]