28171820

素因数分解:

$2^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{2131}}^1$

素因数の和:2801

約数の個数: 24

約数和(自身を含む): 59278128

約数和(自身を除く): 31106308

約数列:

[1, 2, 4, 5, 10, 20, 661, 1322, 2131, 2644, 3305, 4262, 6610, 8524, 10655, 13220, 21310, 42620, 1408591, 2817182, 5634364, 7042955, 14085910, 28171820]

約数ペア:

[(1, 28171820), (2, 14085910), (4, 7042955), (5, 5634364), (10, 2817182), (20, 1408591), (661, 42620), (1322, 21310), (2131, 13220), (2644, 10655), (3305, 8524), (4262, 6610)]