21105189

素因数分解:

$3^2\times 7^1\times {\mathrm{521}}^1\times {\mathrm{643}}^1$

素因数の和:1177

約数の個数: 24

約数和(自身を含む): 34961472

約数和(自身を除く): 13856283

約数列:

[1, 3, 7, 9, 21, 63, 521, 643, 1563, 1929, 3647, 4501, 4689, 5787, 10941, 13503, 32823, 40509, 335003, 1005009, 2345021, 3015027, 7035063, 21105189]

約数ペア:

[(1, 21105189), (3, 7035063), (7, 3015027), (9, 2345021), (21, 1005009), (63, 335003), (521, 40509), (643, 32823), (1563, 13503), (1929, 10941), (3647, 5787), (4501, 4689)]