81317960

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{65579}}^1$

素因数の和:65621

約数の個数: 32

約数和(自身を含む): 188870400

約数和(自身を除く): 107552440

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 65579, 131158, 262316, 327895, 524632, 655790, 1311580, 2032949, 2623160, 4065898, 8131796, 10164745, 16263592, 20329490, 40658980, 81317960]

約数ペア:

[(1, 81317960), (2, 40658980), (4, 20329490), (5, 16263592), (8, 10164745), (10, 8131796), (20, 4065898), (31, 2623160), (40, 2032949), (62, 1311580), (124, 655790), (155, 524632), (248, 327895), (310, 262316), (620, 131158), (1240, 65579)]