20004495

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{1601}}^1$

素因数の和:1640

約数の個数: 48

約数和(自身を含む): 39447648

約数和(自身を除く): 19443153

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 49, 51, 85, 105, 119, 147, 245, 255, 357, 595, 735, 833, 1601, 1785, 2499, 4165, 4803, 8005, 11207, 12495, 24015, 27217, 33621, 56035, 78449, 81651, 136085, 168105, 190519, 235347, 392245, 408255, 571557, 952595, 1176735, 1333633, 2857785, 4000899, 6668165, 20004495]

約数ペア:

[(1, 20004495), (3, 6668165), (5, 4000899), (7, 2857785), (15, 1333633), (17, 1176735), (21, 952595), (35, 571557), (49, 408255), (51, 392245), (85, 235347), (105, 190519), (119, 168105), (147, 136085), (245, 81651), (255, 78449), (357, 56035), (595, 33621), (735, 27217), (833, 24015), (1601, 12495), (1785, 11207), (2499, 8005), (4165, 4803)]