21705813

素因数分解:

$3^4\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{191}}^1$

素因数の和:287

約数の個数: 40

約数和(自身を含む): 34569216

約数和(自身を除く): 12863403

約数列:

[1, 3, 9, 23, 27, 61, 69, 81, 183, 191, 207, 549, 573, 621, 1403, 1647, 1719, 1863, 4209, 4393, 4941, 5157, 11651, 12627, 13179, 15471, 34953, 37881, 39537, 104859, 113643, 118611, 267973, 314577, 355833, 803919, 943731, 2411757, 7235271, 21705813]

約数ペア:

[(1, 21705813), (3, 7235271), (9, 2411757), (23, 943731), (27, 803919), (61, 355833), (69, 314577), (81, 267973), (183, 118611), (191, 113643), (207, 104859), (549, 39537), (573, 37881), (621, 34953), (1403, 15471), (1647, 13179), (1719, 12627), (1863, 11651), (4209, 5157), (4393, 4941)]