20971275

素因数分解:

$3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{157}}^1$

素因数の和:320

約数の個数: 48

約数和(自身を含む): 37851744

約数和(自身を除く): 16880469

約数列:

[1, 3, 5, 13, 15, 25, 39, 65, 75, 137, 157, 195, 325, 411, 471, 685, 785, 975, 1781, 2041, 2055, 2355, 3425, 3925, 5343, 6123, 8905, 10205, 10275, 11775, 21509, 26715, 30615, 44525, 51025, 64527, 107545, 133575, 153075, 279617, 322635, 537725, 838851, 1398085, 1613175, 4194255, 6990425, 20971275]

約数ペア:

[(1, 20971275), (3, 6990425), (5, 4194255), (13, 1613175), (15, 1398085), (25, 838851), (39, 537725), (65, 322635), (75, 279617), (137, 153075), (157, 133575), (195, 107545), (325, 64527), (411, 51025), (471, 44525), (685, 30615), (785, 26715), (975, 21509), (1781, 11775), (2041, 10275), (2055, 10205), (2355, 8905), (3425, 6123), (3925, 5343)]