21395175

素因数分解:

$3^1\times 5^2\times {\mathrm{23}}^1\times {\mathrm{79}}^1\times {\mathrm{157}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 37616640

約数和(自身を除く): 16221465

約数列:

[1, 3, 5, 15, 23, 25, 69, 75, 79, 115, 157, 237, 345, 395, 471, 575, 785, 1185, 1725, 1817, 1975, 2355, 3611, 3925, 5451, 5925, 9085, 10833, 11775, 12403, 18055, 27255, 37209, 45425, 54165, 62015, 90275, 136275, 186045, 270825, 285269, 310075, 855807, 930225, 1426345, 4279035, 7131725, 21395175]

約数ペア:

[(1, 21395175), (3, 7131725), (5, 4279035), (15, 1426345), (23, 930225), (25, 855807), (69, 310075), (75, 285269), (79, 270825), (115, 186045), (157, 136275), (237, 90275), (345, 62015), (395, 54165), (471, 45425), (575, 37209), (785, 27255), (1185, 18055), (1725, 12403), (1817, 11775), (1975, 10833), (2355, 9085), (3611, 5925), (3925, 5451)]