81664420

素因数分解:

$2^2\times 5^1\times {\mathrm{571}}^1\times {\mathrm{7151}}^1$

素因数の和:7731

約数の個数: 24

約数和(自身を含む): 171819648

約数和(自身を除く): 90155228

約数列:

[1, 2, 4, 5, 10, 20, 571, 1142, 2284, 2855, 5710, 7151, 11420, 14302, 28604, 35755, 71510, 143020, 4083221, 8166442, 16332884, 20416105, 40832210, 81664420]

約数ペア:

[(1, 81664420), (2, 40832210), (4, 20416105), (5, 16332884), (10, 8166442), (20, 4083221), (571, 143020), (1142, 71510), (2284, 35755), (2855, 28604), (5710, 14302), (7151, 11420)]