19889680

素因数分解:

$2^4\times 5^1\times {\mathrm{248621}}^1$

素因数の和:248634

約数の個数: 20

約数和(自身を含む): 46243692

約数和(自身を除く): 26354012

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 248621, 497242, 994484, 1243105, 1988968, 2486210, 3977936, 4972420, 9944840, 19889680]

約数ペア:

[(1, 19889680), (2, 9944840), (4, 4972420), (5, 3977936), (8, 2486210), (10, 1988968), (16, 1243105), (20, 994484), (40, 497242), (80, 248621)]