20845640

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16811}}^1$

素因数の和:16853

約数の個数: 32

約数和(自身を含む): 48418560

約数和(自身を除く): 27572920

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16811, 33622, 67244, 84055, 134488, 168110, 336220, 521141, 672440, 1042282, 2084564, 2605705, 4169128, 5211410, 10422820, 20845640]

約数ペア:

[(1, 20845640), (2, 10422820), (4, 5211410), (5, 4169128), (8, 2605705), (10, 2084564), (20, 1042282), (31, 672440), (40, 521141), (62, 336220), (124, 168110), (155, 134488), (248, 84055), (310, 67244), (620, 33622), (1240, 16811)]