21979990

素因数分解:

$2^1\times 5^1\times {\mathrm{269}}^1\times {\mathrm{8171}}^1$

素因数の和:8447

約数の個数: 16

約数和(自身を含む): 39715920

約数和(自身を除く): 17735930

約数列:

[1, 2, 5, 10, 269, 538, 1345, 2690, 8171, 16342, 40855, 81710, 2197999, 4395998, 10989995, 21979990]

約数ペア:

[(1, 21979990), (2, 10989995), (5, 4395998), (10, 2197999), (269, 81710), (538, 40855), (1345, 16342), (2690, 8171)]