21438440

素因数分解:

$2^3\times 5^1\times {\mathrm{193}}^1\times {\mathrm{2777}}^1$

素因数の和:2981

約数の個数: 32

約数和(自身を含む): 48503880

約数和(自身を除く): 27065440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 193, 386, 772, 965, 1544, 1930, 2777, 3860, 5554, 7720, 11108, 13885, 22216, 27770, 55540, 111080, 535961, 1071922, 2143844, 2679805, 4287688, 5359610, 10719220, 21438440]

約数ペア:

[(1, 21438440), (2, 10719220), (4, 5359610), (5, 4287688), (8, 2679805), (10, 2143844), (20, 1071922), (40, 535961), (193, 111080), (386, 55540), (772, 27770), (965, 22216), (1544, 13885), (1930, 11108), (2777, 7720), (3860, 5554)]