18991364

素因数分解:

$2^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{233}}^1$

素因数の和:356

約数の個数: 48

約数和(自身を含む): 39626496

約数和(自身を除く): 20635132

約数列:

[1, 2, 4, 7, 14, 28, 41, 71, 82, 142, 164, 233, 284, 287, 466, 497, 574, 932, 994, 1148, 1631, 1988, 2911, 3262, 5822, 6524, 9553, 11644, 16543, 19106, 20377, 33086, 38212, 40754, 66172, 66871, 81508, 115801, 133742, 231602, 267484, 463204, 678263, 1356526, 2713052, 4747841, 9495682, 18991364]

約数ペア:

[(1, 18991364), (2, 9495682), (4, 4747841), (7, 2713052), (14, 1356526), (28, 678263), (41, 463204), (71, 267484), (82, 231602), (142, 133742), (164, 115801), (233, 81508), (284, 66871), (287, 66172), (466, 40754), (497, 38212), (574, 33086), (932, 20377), (994, 19106), (1148, 16543), (1631, 11644), (1988, 9553), (2911, 6524), (3262, 5822)]