81191780

素因数分解:

$2^2\times 5^1\times {\mathrm{431}}^1\times {\mathrm{9419}}^1$

素因数の和:9859

約数の個数: 24

約数和(自身を含む): 170916480

約数和(自身を除く): 89724700

約数列:

[1, 2, 4, 5, 10, 20, 431, 862, 1724, 2155, 4310, 8620, 9419, 18838, 37676, 47095, 94190, 188380, 4059589, 8119178, 16238356, 20297945, 40595890, 81191780]

約数ペア:

[(1, 81191780), (2, 40595890), (4, 20297945), (5, 16238356), (10, 8119178), (20, 4059589), (431, 188380), (862, 94190), (1724, 47095), (2155, 37676), (4310, 18838), (8620, 9419)]