21405940

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{10597}}^1$

素因数の和:10707

約数の個数: 24

約数和(自身を含む): 45401832

約数和(自身を除く): 23995892

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 10597, 21194, 42388, 52985, 105970, 211940, 1070297, 2140594, 4281188, 5351485, 10702970, 21405940]

約数ペア:

[(1, 21405940), (2, 10702970), (4, 5351485), (5, 4281188), (10, 2140594), (20, 1070297), (101, 211940), (202, 105970), (404, 52985), (505, 42388), (1010, 21194), (2020, 10597)]