21065980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81023}}^1$

素因数の和:81045

約数の個数: 24

約数和(自身を含む): 47642112

約数和(自身を除く): 26576132

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81023, 162046, 324092, 405115, 810230, 1053299, 1620460, 2106598, 4213196, 5266495, 10532990, 21065980]

約数ペア:

[(1, 21065980), (2, 10532990), (4, 5266495), (5, 4213196), (10, 2106598), (13, 1620460), (20, 1053299), (26, 810230), (52, 405115), (65, 324092), (130, 162046), (260, 81023)]