21780339

素因数分解:

$3^1\times 7^1\times {\mathrm{643}}^1\times {\mathrm{1613}}^1$

素因数の和:2266

約数の個数: 16

約数和(自身を含む): 33261312

約数和(自身を除く): 11480973

約数列:

[1, 3, 7, 21, 643, 1613, 1929, 4501, 4839, 11291, 13503, 33873, 1037159, 3111477, 7260113, 21780339]

約数ペア:

[(1, 21780339), (3, 7260113), (7, 3111477), (21, 1037159), (643, 33873), (1613, 13503), (1929, 11291), (4501, 4839)]