20872120

素因数分解:

$2^3\times 5^1\times {\mathrm{211}}^1\times {\mathrm{2473}}^1$

素因数の和:2695

約数の個数: 32

約数和(自身を含む): 47203920

約数和(自身を除く): 26331800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 211, 422, 844, 1055, 1688, 2110, 2473, 4220, 4946, 8440, 9892, 12365, 19784, 24730, 49460, 98920, 521803, 1043606, 2087212, 2609015, 4174424, 5218030, 10436060, 20872120]

約数ペア:

[(1, 20872120), (2, 10436060), (4, 5218030), (5, 4174424), (8, 2609015), (10, 2087212), (20, 1043606), (40, 521803), (211, 98920), (422, 49460), (844, 24730), (1055, 19784), (1688, 12365), (2110, 9892), (2473, 8440), (4220, 4946)]