21391209

素因数分解:

$3^4\times 7^1\times {\mathrm{31}}^1\times {\mathrm{1217}}^1$

素因数の和:1267

約数の個数: 40

約数和(自身を含む): 37728768

約数和(自身を除く): 16337559

約数列:

[1, 3, 7, 9, 21, 27, 31, 63, 81, 93, 189, 217, 279, 567, 651, 837, 1217, 1953, 2511, 3651, 5859, 8519, 10953, 17577, 25557, 32859, 37727, 76671, 98577, 113181, 230013, 264089, 339543, 690039, 792267, 1018629, 2376801, 3055887, 7130403, 21391209]

約数ペア:

[(1, 21391209), (3, 7130403), (7, 3055887), (9, 2376801), (21, 1018629), (27, 792267), (31, 690039), (63, 339543), (81, 264089), (93, 230013), (189, 113181), (217, 98577), (279, 76671), (567, 37727), (651, 32859), (837, 25557), (1217, 17577), (1953, 10953), (2511, 8519), (3651, 5859)]