8320420

素因数分解:

$2^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{647}}^1$

素因数の和:1299

約数の個数: 24

約数和(自身を含む): 17527104

約数和(自身を除く): 9206684

約数列:

[1, 2, 4, 5, 10, 20, 643, 647, 1286, 1294, 2572, 2588, 3215, 3235, 6430, 6470, 12860, 12940, 416021, 832042, 1664084, 2080105, 4160210, 8320420]

約数ペア:

[(1, 8320420), (2, 4160210), (4, 2080105), (5, 1664084), (10, 832042), (20, 416021), (643, 12940), (647, 12860), (1286, 6470), (1294, 6430), (2572, 3235), (2588, 3215)]