31561480

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{1607}}^1$

素因数の和:2109

約数の個数: 32

約数和(自身を含む): 71202240

約数和(自身を除く): 39640760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 982, 1607, 1964, 2455, 3214, 3928, 4910, 6428, 8035, 9820, 12856, 16070, 19640, 32140, 64280, 789037, 1578074, 3156148, 3945185, 6312296, 7890370, 15780740, 31561480]

約数ペア:

[(1, 31561480), (2, 15780740), (4, 7890370), (5, 6312296), (8, 3945185), (10, 3156148), (20, 1578074), (40, 789037), (491, 64280), (982, 32140), (1607, 19640), (1964, 16070), (2455, 12856), (3214, 9820), (3928, 8035), (4910, 6428)]