21278367

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{37}}^2\times {\mathrm{157}}^1$

素因数の和:248

約数の個数: 36

約数和(自身を含む): 34679736

約数和(自身を除く): 13401369

約数列:

[1, 3, 9, 11, 33, 37, 99, 111, 157, 333, 407, 471, 1221, 1369, 1413, 1727, 3663, 4107, 5181, 5809, 12321, 15059, 15543, 17427, 45177, 52281, 63899, 135531, 191697, 214933, 575091, 644799, 1934397, 2364263, 7092789, 21278367]

約数ペア:

[(1, 21278367), (3, 7092789), (9, 2364263), (11, 1934397), (33, 644799), (37, 575091), (99, 214933), (111, 191697), (157, 135531), (333, 63899), (407, 52281), (471, 45177), (1221, 17427), (1369, 15543), (1413, 15059), (1727, 12321), (3663, 5809), (4107, 5181)]