19997980

素因数分解:

$2^2\times 5^1\times {\mathrm{307}}^1\times {\mathrm{3257}}^1$

素因数の和:3573

約数の個数: 24

約数和(自身を含む): 42145488

約数和(自身を除く): 22147508

約数列:

[1, 2, 4, 5, 10, 20, 307, 614, 1228, 1535, 3070, 3257, 6140, 6514, 13028, 16285, 32570, 65140, 999899, 1999798, 3999596, 4999495, 9998990, 19997980]

約数ペア:

[(1, 19997980), (2, 9998990), (4, 4999495), (5, 3999596), (10, 1999798), (20, 999899), (307, 65140), (614, 32570), (1228, 16285), (1535, 13028), (3070, 6514), (3257, 6140)]