21163960

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{67}}^1\times {\mathrm{149}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 49572000

約数和(自身を除く): 28408040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 67, 106, 134, 149, 212, 265, 268, 298, 335, 424, 530, 536, 596, 670, 745, 1060, 1192, 1340, 1490, 2120, 2680, 2980, 3551, 5960, 7102, 7897, 9983, 14204, 15794, 17755, 19966, 28408, 31588, 35510, 39485, 39932, 49915, 63176, 71020, 78970, 79864, 99830, 142040, 157940, 199660, 315880, 399320, 529099, 1058198, 2116396, 2645495, 4232792, 5290990, 10581980, 21163960]

約数ペア:

[(1, 21163960), (2, 10581980), (4, 5290990), (5, 4232792), (8, 2645495), (10, 2116396), (20, 1058198), (40, 529099), (53, 399320), (67, 315880), (106, 199660), (134, 157940), (149, 142040), (212, 99830), (265, 79864), (268, 78970), (298, 71020), (335, 63176), (424, 49915), (530, 39932), (536, 39485), (596, 35510), (670, 31588), (745, 28408), (1060, 19966), (1192, 17755), (1340, 15794), (1490, 14204), (2120, 9983), (2680, 7897), (2980, 7102), (3551, 5960)]