81671960

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{3919}}^1$

素因数の和:4451

約数の個数: 32

約数和(自身を含む): 184161600

約数和(自身を除く): 102489640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1042, 2084, 2605, 3919, 4168, 5210, 7838, 10420, 15676, 19595, 20840, 31352, 39190, 78380, 156760, 2041799, 4083598, 8167196, 10208995, 16334392, 20417990, 40835980, 81671960]

約数ペア:

[(1, 81671960), (2, 40835980), (4, 20417990), (5, 16334392), (8, 10208995), (10, 8167196), (20, 4083598), (40, 2041799), (521, 156760), (1042, 78380), (2084, 39190), (2605, 31352), (3919, 20840), (4168, 19595), (5210, 15676), (7838, 10420)]