21108815

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{2729}}^1$

素因数の和:2771

約数の個数: 32

約数和(自身を含む): 33022080

約数和(自身を除く): 11913265

約数列:

[1, 5, 7, 13, 17, 35, 65, 85, 91, 119, 221, 455, 595, 1105, 1547, 2729, 7735, 13645, 19103, 35477, 46393, 95515, 177385, 231965, 248339, 324751, 603109, 1241695, 1623755, 3015545, 4221763, 21108815]

約数ペア:

[(1, 21108815), (5, 4221763), (7, 3015545), (13, 1623755), (17, 1241695), (35, 603109), (65, 324751), (85, 248339), (91, 231965), (119, 177385), (221, 95515), (455, 46393), (595, 35477), (1105, 19103), (1547, 13645), (2729, 7735)]