20815280

素因数分解:

$2^4\times 5^1\times {\mathrm{260191}}^1$

素因数の和:260204

約数の個数: 20

約数和(自身を含む): 48395712

約数和(自身を除く): 27580432

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 260191, 520382, 1040764, 1300955, 2081528, 2601910, 4163056, 5203820, 10407640, 20815280]

約数ペア:

[(1, 20815280), (2, 10407640), (4, 5203820), (5, 4163056), (8, 2601910), (10, 2081528), (16, 1300955), (20, 1040764), (40, 520382), (80, 260191)]