20640970

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{149}}^1\times {\mathrm{1979}}^1$

素因数の和:2142

約数の個数: 32

約数和(自身を含む): 42768000

約数和(自身を除く): 22127030

約数列:

[1, 2, 5, 7, 10, 14, 35, 70, 149, 298, 745, 1043, 1490, 1979, 2086, 3958, 5215, 9895, 10430, 13853, 19790, 27706, 69265, 138530, 294871, 589742, 1474355, 2064097, 2948710, 4128194, 10320485, 20640970]

約数ペア:

[(1, 20640970), (2, 10320485), (5, 4128194), (7, 2948710), (10, 2064097), (14, 1474355), (35, 589742), (70, 294871), (149, 138530), (298, 69265), (745, 27706), (1043, 19790), (1490, 13853), (1979, 10430), (2086, 9895), (3958, 5215)]