20391020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78427}}^1$

素因数の和:78449

約数の個数: 24

約数和(自身を含む): 46115664

約数和(自身を除く): 25724644

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 78427, 156854, 313708, 392135, 784270, 1019551, 1568540, 2039102, 4078204, 5097755, 10195510, 20391020]

約数ペア:

[(1, 20391020), (2, 10195510), (4, 5097755), (5, 4078204), (10, 2039102), (13, 1568540), (20, 1019551), (26, 784270), (52, 392135), (65, 313708), (130, 156854), (260, 78427)]