21770091

素因数分解:

$3^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 37859328

約数和(自身を除く): 16089237

約数列:

[1, 3, 7, 9, 21, 31, 63, 71, 93, 157, 213, 217, 279, 471, 497, 639, 651, 1099, 1413, 1491, 1953, 2201, 3297, 4473, 4867, 6603, 9891, 11147, 14601, 15407, 19809, 33441, 34069, 43803, 46221, 78029, 100323, 102207, 138663, 234087, 306621, 345557, 702261, 1036671, 2418899, 3110013, 7256697, 21770091]

約数ペア:

[(1, 21770091), (3, 7256697), (7, 3110013), (9, 2418899), (21, 1036671), (31, 702261), (63, 345557), (71, 306621), (93, 234087), (157, 138663), (213, 102207), (217, 100323), (279, 78029), (471, 46221), (497, 43803), (639, 34069), (651, 33441), (1099, 19809), (1413, 15407), (1491, 14601), (1953, 11147), (2201, 9891), (3297, 6603), (4473, 4867)]