20400820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1973}}^1$

素因数の和:2040

約数の個数: 48

約数和(自身を含む): 47755008

約数和(自身を除く): 27354188

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 47, 55, 94, 110, 188, 220, 235, 470, 517, 940, 1034, 1973, 2068, 2585, 3946, 5170, 7892, 9865, 10340, 19730, 21703, 39460, 43406, 86812, 92731, 108515, 185462, 217030, 370924, 434060, 463655, 927310, 1020041, 1854620, 2040082, 4080164, 5100205, 10200410, 20400820]

約数ペア:

[(1, 20400820), (2, 10200410), (4, 5100205), (5, 4080164), (10, 2040082), (11, 1854620), (20, 1020041), (22, 927310), (44, 463655), (47, 434060), (55, 370924), (94, 217030), (110, 185462), (188, 108515), (220, 92731), (235, 86812), (470, 43406), (517, 39460), (940, 21703), (1034, 19730), (1973, 10340), (2068, 9865), (2585, 7892), (3946, 5170)]