19665680

素因数分解:

$2^4\times 5^1\times {\mathrm{245821}}^1$

素因数の和:245834

約数の個数: 20

約数和(自身を含む): 45722892

約数和(自身を除く): 26057212

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 245821, 491642, 983284, 1229105, 1966568, 2458210, 3933136, 4916420, 9832840, 19665680]

約数ペア:

[(1, 19665680), (2, 9832840), (4, 4916420), (5, 3933136), (8, 2458210), (10, 1966568), (16, 1229105), (20, 983284), (40, 491642), (80, 245821)]