20805460

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80021}}^1$

素因数の和:80043

約数の個数: 24

約数和(自身を含む): 47052936

約数和(自身を除く): 26247476

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80021, 160042, 320084, 400105, 800210, 1040273, 1600420, 2080546, 4161092, 5201365, 10402730, 20805460]

約数ペア:

[(1, 20805460), (2, 10402730), (4, 5201365), (5, 4161092), (10, 2080546), (13, 1600420), (20, 1040273), (26, 800210), (52, 400105), (65, 320084), (130, 160042), (260, 80021)]