21260155

素因数分解:

$5^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1\times {\mathrm{157}}^1$

素因数の和:295

約数の個数: 32

約数和(自身を含む): 30305664

約数和(自身を除く): 9045509

約数列:

[1, 5, 7, 35, 53, 73, 157, 265, 365, 371, 511, 785, 1099, 1855, 2555, 3869, 5495, 8321, 11461, 19345, 27083, 41605, 57305, 58247, 80227, 135415, 291235, 401135, 607433, 3037165, 4252031, 21260155]

約数ペア:

[(1, 21260155), (5, 4252031), (7, 3037165), (35, 607433), (53, 401135), (73, 291235), (157, 135415), (265, 80227), (365, 58247), (371, 57305), (511, 41605), (785, 27083), (1099, 19345), (1855, 11461), (2555, 8321), (3869, 5495)]