81290890

素因数分解:

$2^1\times 5^1\times {\mathrm{421}}^1\times {\mathrm{19309}}^1$

素因数の和:19737

約数の個数: 16

約数和(自身を含む): 146678760

約数和(自身を除く): 65387870

約数列:

[1, 2, 5, 10, 421, 842, 2105, 4210, 19309, 38618, 96545, 193090, 8129089, 16258178, 40645445, 81290890]

約数ペア:

[(1, 81290890), (2, 40645445), (5, 16258178), (10, 8129089), (421, 193090), (842, 96545), (2105, 38618), (4210, 19309)]