20655675

素因数分解:

$3^3\times 5^2\times {\mathrm{71}}^1\times {\mathrm{431}}^1$

素因数の和:521

約数の個数: 48

約数和(自身を含む): 38568960

約数和(自身を除く): 17913285

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 71, 75, 135, 213, 225, 355, 431, 639, 675, 1065, 1293, 1775, 1917, 2155, 3195, 3879, 5325, 6465, 9585, 10775, 11637, 15975, 19395, 30601, 32325, 47925, 58185, 91803, 96975, 153005, 275409, 290925, 459015, 765025, 826227, 1377045, 2295075, 4131135, 6885225, 20655675]

約数ペア:

[(1, 20655675), (3, 6885225), (5, 4131135), (9, 2295075), (15, 1377045), (25, 826227), (27, 765025), (45, 459015), (71, 290925), (75, 275409), (135, 153005), (213, 96975), (225, 91803), (355, 58185), (431, 47925), (639, 32325), (675, 30601), (1065, 19395), (1293, 15975), (1775, 11637), (1917, 10775), (2155, 9585), (3195, 6465), (3879, 5325)]