21198020

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11909}}^1$

素因数の和:12007

約数の個数: 24

約数和(自身を含む): 45019800

約数和(自身を除く): 23821780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11909, 23818, 47636, 59545, 119090, 238180, 1059901, 2119802, 4239604, 5299505, 10599010, 21198020]

約数ペア:

[(1, 21198020), (2, 10599010), (4, 5299505), (5, 4239604), (10, 2119802), (20, 1059901), (89, 238180), (178, 119090), (356, 59545), (445, 47636), (890, 23818), (1780, 11909)]