20213991

素因数分解:

$3^2\times 7^1\times {\mathrm{499}}^1\times {\mathrm{643}}^1$

素因数の和:1155

約数の個数: 24

約数和(自身を含む): 33488000

約数和(自身を除く): 13274009

約数列:

[1, 3, 7, 9, 21, 63, 499, 643, 1497, 1929, 3493, 4491, 4501, 5787, 10479, 13503, 31437, 40509, 320857, 962571, 2245999, 2887713, 6737997, 20213991]

約数ペア:

[(1, 20213991), (3, 6737997), (7, 2887713), (9, 2245999), (21, 962571), (63, 320857), (499, 40509), (643, 31437), (1497, 13503), (1929, 10479), (3493, 5787), (4491, 4501)]