21780250

素因数分解:

$2^1\times 5^3\times {\mathrm{87121}}^1$

素因数の和:87138

約数の個数: 16

約数和(自身を含む): 40773096

約数和(自身を除く): 18992846

約数列:

[1, 2, 5, 10, 25, 50, 125, 250, 87121, 174242, 435605, 871210, 2178025, 4356050, 10890125, 21780250]

約数ペア:

[(1, 21780250), (2, 10890125), (5, 4356050), (10, 2178025), (25, 871210), (50, 435605), (125, 174242), (250, 87121)]