21998020

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{99991}}^1$

素因数の和:100011

約数の個数: 24

約数和(自身を含む): 50395968

約数和(自身を除く): 28397948

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 99991, 199982, 399964, 499955, 999910, 1099901, 1999820, 2199802, 4399604, 5499505, 10999010, 21998020]

約数ペア:

[(1, 21998020), (2, 10999010), (4, 5499505), (5, 4399604), (10, 2199802), (11, 1999820), (20, 1099901), (22, 999910), (44, 499955), (55, 399964), (110, 199982), (220, 99991)]