21980990

素因数分解:

$2^1\times 5^1\times {\mathrm{521}}^1\times {\mathrm{4219}}^1$

素因数の和:4747

約数の個数: 16

約数和(自身を含む): 39651120

約数和(自身を除く): 17670130

約数列:

[1, 2, 5, 10, 521, 1042, 2605, 4219, 5210, 8438, 21095, 42190, 2198099, 4396198, 10990495, 21980990]

約数ペア:

[(1, 21980990), (2, 10990495), (5, 4396198), (10, 2198099), (521, 42190), (1042, 21095), (2605, 8438), (4219, 5210)]