81291920

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{32779}}^1$

素因数の和:32823

約数の個数: 40

約数和(自身を含む): 195106560

約数和(自身を除く): 113814640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 32779, 65558, 131116, 163895, 262232, 327790, 524464, 655580, 1016149, 1311160, 2032298, 2622320, 4064596, 5080745, 8129192, 10161490, 16258384, 20322980, 40645960, 81291920]

約数ペア:

[(1, 81291920), (2, 40645960), (4, 20322980), (5, 16258384), (8, 10161490), (10, 8129192), (16, 5080745), (20, 4064596), (31, 2622320), (40, 2032298), (62, 1311160), (80, 1016149), (124, 655580), (155, 524464), (248, 327790), (310, 262232), (496, 163895), (620, 131116), (1240, 65558), (2480, 32779)]