20640548

素因数分解:

$2^2\times {\mathrm{41}}^1\times {\mathrm{127}}^1\times {\mathrm{991}}^1$

素因数の和:1163

約数の個数: 24

約数和(自身を含む): 37330944

約数和(自身を除く): 16690396

約数列:

[1, 2, 4, 41, 82, 127, 164, 254, 508, 991, 1982, 3964, 5207, 10414, 20828, 40631, 81262, 125857, 162524, 251714, 503428, 5160137, 10320274, 20640548]

約数ペア:

[(1, 20640548), (2, 10320274), (4, 5160137), (41, 503428), (82, 251714), (127, 162524), (164, 125857), (254, 81262), (508, 40631), (991, 20828), (1982, 10414), (3964, 5207)]