21348680

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{1087}}^1$

素因数の和:1589

約数の個数: 32

約数和(自身を含む): 48176640

約数和(自身を除く): 26827960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1087, 1964, 2174, 2455, 3928, 4348, 4910, 5435, 8696, 9820, 10870, 19640, 21740, 43480, 533717, 1067434, 2134868, 2668585, 4269736, 5337170, 10674340, 21348680]

約数ペア:

[(1, 21348680), (2, 10674340), (4, 5337170), (5, 4269736), (8, 2668585), (10, 2134868), (20, 1067434), (40, 533717), (491, 43480), (982, 21740), (1087, 19640), (1964, 10870), (2174, 9820), (2455, 8696), (3928, 5435), (4348, 4910)]