81221780

素因数分解:

$2^2\times 5^1\times {\mathrm{769}}^1\times {\mathrm{5281}}^1$

素因数の和:6059

約数の個数: 24

約数和(自身を含む): 170819880

約数和(自身を除く): 89598100

約数列:

[1, 2, 4, 5, 10, 20, 769, 1538, 3076, 3845, 5281, 7690, 10562, 15380, 21124, 26405, 52810, 105620, 4061089, 8122178, 16244356, 20305445, 40610890, 81221780]

約数ペア:

[(1, 81221780), (2, 40610890), (4, 20305445), (5, 16244356), (10, 8122178), (20, 4061089), (769, 105620), (1538, 52810), (3076, 26405), (3845, 21124), (5281, 15380), (7690, 10562)]