20891260

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4229}}^1$

素因数の和:4270

約数の個数: 48

約数和(自身を含む): 49744800

約数和(自身を除く): 28853540

約数列:

[1, 2, 4, 5, 10, 13, 19, 20, 26, 38, 52, 65, 76, 95, 130, 190, 247, 260, 380, 494, 988, 1235, 2470, 4229, 4940, 8458, 16916, 21145, 42290, 54977, 80351, 84580, 109954, 160702, 219908, 274885, 321404, 401755, 549770, 803510, 1044563, 1099540, 1607020, 2089126, 4178252, 5222815, 10445630, 20891260]

約数ペア:

[(1, 20891260), (2, 10445630), (4, 5222815), (5, 4178252), (10, 2089126), (13, 1607020), (19, 1099540), (20, 1044563), (26, 803510), (38, 549770), (52, 401755), (65, 321404), (76, 274885), (95, 219908), (130, 160702), (190, 109954), (247, 84580), (260, 80351), (380, 54977), (494, 42290), (988, 21145), (1235, 16916), (2470, 8458), (4229, 4940)]