81840280

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{28817}}^1$

素因数の和:28899

約数の個数: 32

約数和(自身を含む): 186740640

約数和(自身を除く): 104900360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 28817, 57634, 115268, 144085, 230536, 288170, 576340, 1152680, 2046007, 4092014, 8184028, 10230035, 16368056, 20460070, 40920140, 81840280]

約数ペア:

[(1, 81840280), (2, 40920140), (4, 20460070), (5, 16368056), (8, 10230035), (10, 8184028), (20, 4092014), (40, 2046007), (71, 1152680), (142, 576340), (284, 288170), (355, 230536), (568, 144085), (710, 115268), (1420, 57634), (2840, 28817)]