81996680

素因数分解:

$2^3\times 5^1\times {\mathrm{251}}^1\times {\mathrm{8167}}^1$

素因数の和:8429

約数の個数: 32

約数和(自身を含む): 185250240

約数和(自身を除く): 103253560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 251, 502, 1004, 1255, 2008, 2510, 5020, 8167, 10040, 16334, 32668, 40835, 65336, 81670, 163340, 326680, 2049917, 4099834, 8199668, 10249585, 16399336, 20499170, 40998340, 81996680]

約数ペア:

[(1, 81996680), (2, 40998340), (4, 20499170), (5, 16399336), (8, 10249585), (10, 8199668), (20, 4099834), (40, 2049917), (251, 326680), (502, 163340), (1004, 81670), (1255, 65336), (2008, 40835), (2510, 32668), (5020, 16334), (8167, 10040)]