21177160

素因数分解:

$2^3\times 5^1\times {\mathrm{389}}^1\times {\mathrm{1361}}^1$

素因数の和:1761

約数の個数: 32

約数和(自身を含む): 47806200

約数和(自身を除く): 26629040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 389, 778, 1361, 1556, 1945, 2722, 3112, 3890, 5444, 6805, 7780, 10888, 13610, 15560, 27220, 54440, 529429, 1058858, 2117716, 2647145, 4235432, 5294290, 10588580, 21177160]

約数ペア:

[(1, 21177160), (2, 10588580), (4, 5294290), (5, 4235432), (8, 2647145), (10, 2117716), (20, 1058858), (40, 529429), (389, 54440), (778, 27220), (1361, 15560), (1556, 13610), (1945, 10888), (2722, 7780), (3112, 6805), (3890, 5444)]