81200620

素因数分解:

$2^2\times 5^1\times {\mathrm{1951}}^1\times {\mathrm{2081}}^1$

素因数の和:4041

約数の個数: 24

約数和(自身を含む): 170690688

約数和(自身を除く): 89490068

約数列:

[1, 2, 4, 5, 10, 20, 1951, 2081, 3902, 4162, 7804, 8324, 9755, 10405, 19510, 20810, 39020, 41620, 4060031, 8120062, 16240124, 20300155, 40600310, 81200620]

約数ペア:

[(1, 81200620), (2, 40600310), (4, 20300155), (5, 16240124), (10, 8120062), (20, 4060031), (1951, 41620), (2081, 39020), (3902, 20810), (4162, 19510), (7804, 10405), (8324, 9755)]