21028220

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13309}}^1$

素因数の和:13397

約数の個数: 24

約数和(自身を含む): 44721600

約数和(自身を除く): 23693380

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13309, 26618, 53236, 66545, 133090, 266180, 1051411, 2102822, 4205644, 5257055, 10514110, 21028220]

約数ペア:

[(1, 21028220), (2, 10514110), (4, 5257055), (5, 4205644), (10, 2102822), (20, 1051411), (79, 266180), (158, 133090), (316, 66545), (395, 53236), (790, 26618), (1580, 13309)]