21080215

素因数分解:

$5^1\times {\mathrm{13}}^3\times {\mathrm{19}}^1\times {\mathrm{101}}^1$

素因数の和:164

約数の個数: 32

約数和(自身を含む): 29131200

約数和(自身を除く): 8050985

約数列:

[1, 5, 13, 19, 65, 95, 101, 169, 247, 505, 845, 1235, 1313, 1919, 2197, 3211, 6565, 9595, 10985, 16055, 17069, 24947, 41743, 85345, 124735, 208715, 221897, 324311, 1109485, 1621555, 4216043, 21080215]

約数ペア:

[(1, 21080215), (5, 4216043), (13, 1621555), (19, 1109485), (65, 324311), (95, 221897), (101, 208715), (169, 124735), (247, 85345), (505, 41743), (845, 24947), (1235, 17069), (1313, 16055), (1919, 10985), (2197, 9595), (3211, 6565)]