21978220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{99901}}^1$

素因数の和:99921

約数の個数: 24

約数和(自身を含む): 50350608

約数和(自身を除く): 28372388

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 99901, 199802, 399604, 499505, 999010, 1098911, 1998020, 2197822, 4395644, 5494555, 10989110, 21978220]

約数ペア:

[(1, 21978220), (2, 10989110), (4, 5494555), (5, 4395644), (10, 2197822), (11, 1998020), (20, 1098911), (22, 999010), (44, 499505), (55, 399604), (110, 199802), (220, 99901)]