21357791

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1\times {\mathrm{113}}^1$

素因数の和:231

約数の個数: 32

約数和(自身を含む): 27783168

約数和(自身を除く): 6425377

約数列:

[1, 7, 13, 31, 67, 91, 113, 217, 403, 469, 791, 871, 1469, 2077, 2821, 3503, 6097, 7571, 10283, 14539, 24521, 27001, 45539, 52997, 98423, 189007, 234701, 318773, 688961, 1642907, 3051113, 21357791]

約数ペア:

[(1, 21357791), (7, 3051113), (13, 1642907), (31, 688961), (67, 318773), (91, 234701), (113, 189007), (217, 98423), (403, 52997), (469, 45539), (791, 27001), (871, 24521), (1469, 14539), (2077, 10283), (2821, 7571), (3503, 6097)]