81857980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^2\times {\mathrm{4259}}^1$

素因数の和:4330

約数の個数: 36

約数和(自身を含む): 177667560

約数和(自身を除く): 95809580

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 961, 1922, 3844, 4259, 4805, 8518, 9610, 17036, 19220, 21295, 42590, 85180, 132029, 264058, 528116, 660145, 1320290, 2640580, 4092899, 8185798, 16371596, 20464495, 40928990, 81857980]

約数ペア:

[(1, 81857980), (2, 40928990), (4, 20464495), (5, 16371596), (10, 8185798), (20, 4092899), (31, 2640580), (62, 1320290), (124, 660145), (155, 528116), (310, 264058), (620, 132029), (961, 85180), (1922, 42590), (3844, 21295), (4259, 19220), (4805, 17036), (8518, 9610)]