21086420

素因数分解:

$2^2\times 5^1\times {\mathrm{1054321}}^1$

素因数の和:1054330

約数の個数: 12

約数和(自身を含む): 44281524

約数和(自身を除く): 23195104

約数列:

[1, 2, 4, 5, 10, 20, 1054321, 2108642, 4217284, 5271605, 10543210, 21086420]

約数ペア:

[(1, 21086420), (2, 10543210), (4, 5271605), (5, 4217284), (10, 2108642), (20, 1054321)]