21664540

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7793}}^1$

素因数の和:7941

約数の個数: 24

約数和(自身を含む): 45828720

約数和(自身を除く): 24164180

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7793, 15586, 31172, 38965, 77930, 155860, 1083227, 2166454, 4332908, 5416135, 10832270, 21664540]

約数ペア:

[(1, 21664540), (2, 10832270), (4, 5416135), (5, 4332908), (10, 2166454), (20, 1083227), (139, 155860), (278, 77930), (556, 38965), (695, 31172), (1390, 15586), (2780, 7793)]