21660015

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{277}}^1\times {\mathrm{401}}^1$

素因数の和:699

約数の個数: 32

約数和(自身を含む): 37550016

約数和(自身を除く): 15890001

約数列:

[1, 3, 5, 13, 15, 39, 65, 195, 277, 401, 831, 1203, 1385, 2005, 3601, 4155, 5213, 6015, 10803, 15639, 18005, 26065, 54015, 78195, 111077, 333231, 555385, 1444001, 1666155, 4332003, 7220005, 21660015]

約数ペア:

[(1, 21660015), (3, 7220005), (5, 4332003), (13, 1666155), (15, 1444001), (39, 555385), (65, 333231), (195, 111077), (277, 78195), (401, 54015), (831, 26065), (1203, 18005), (1385, 15639), (2005, 10803), (3601, 6015), (4155, 5213)]