21012316

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{313}}^1\times {\mathrm{1291}}^1$

素因数の和:1621

約数の個数: 24

約数和(自身を含む): 39757424

約数和(自身を除く): 18745108

約数列:

[1, 2, 4, 13, 26, 52, 313, 626, 1252, 1291, 2582, 4069, 5164, 8138, 16276, 16783, 33566, 67132, 404083, 808166, 1616332, 5253079, 10506158, 21012316]

約数ペア:

[(1, 21012316), (2, 10506158), (4, 5253079), (13, 1616332), (26, 808166), (52, 404083), (313, 67132), (626, 33566), (1252, 16783), (1291, 16276), (2582, 8138), (4069, 5164)]