20921409

素因数分解:

$3^4\times {\mathrm{173}}^1\times {\mathrm{1493}}^1$

素因数の和:1678

約数の個数: 20

約数和(自身を含む): 31454676

約数和(自身を除く): 10533267

約数列:

[1, 3, 9, 27, 81, 173, 519, 1493, 1557, 4479, 4671, 13437, 14013, 40311, 120933, 258289, 774867, 2324601, 6973803, 20921409]

約数ペア:

[(1, 20921409), (3, 6973803), (9, 2324601), (27, 774867), (81, 258289), (173, 120933), (519, 40311), (1493, 14013), (1557, 13437), (4479, 4671)]