20447180

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{78643}}^1$

素因数の和:78665

約数の個数: 24

約数和(自身を含む): 46242672

約数和(自身を除く): 25795492

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 78643, 157286, 314572, 393215, 786430, 1022359, 1572860, 2044718, 4089436, 5111795, 10223590, 20447180]

約数ペア:

[(1, 20447180), (2, 10223590), (4, 5111795), (5, 4089436), (10, 2044718), (13, 1572860), (20, 1022359), (26, 786430), (52, 393215), (65, 314572), (130, 157286), (260, 78643)]