21209795

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{571}}^1$

素因数の和:635

約数の個数: 32

約数和(自身を含む): 29652480

約数和(自身を除く): 8442685

約数列:

[1, 5, 17, 19, 23, 85, 95, 115, 323, 391, 437, 571, 1615, 1955, 2185, 2855, 7429, 9707, 10849, 13133, 37145, 48535, 54245, 65665, 184433, 223261, 249527, 922165, 1116305, 1247635, 4241959, 21209795]

約数ペア:

[(1, 21209795), (5, 4241959), (17, 1247635), (19, 1116305), (23, 922165), (85, 249527), (95, 223261), (115, 184433), (323, 65665), (391, 54245), (437, 48535), (571, 37145), (1615, 13133), (1955, 10849), (2185, 9707), (2855, 7429)]