20617025

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1$

素因数の和:186

約数の個数: 48

約数和(自身を含む): 30831360

約数和(自身を除く): 10214335

約数列:

[1, 5, 11, 13, 25, 55, 65, 73, 79, 143, 275, 325, 365, 395, 715, 803, 869, 949, 1027, 1825, 1975, 3575, 4015, 4345, 4745, 5135, 5767, 10439, 11297, 20075, 21725, 23725, 25675, 28835, 52195, 56485, 63437, 74971, 144175, 260975, 282425, 317185, 374855, 824681, 1585925, 1874275, 4123405, 20617025]

約数ペア:

[(1, 20617025), (5, 4123405), (11, 1874275), (13, 1585925), (25, 824681), (55, 374855), (65, 317185), (73, 282425), (79, 260975), (143, 144175), (275, 74971), (325, 63437), (365, 56485), (395, 52195), (715, 28835), (803, 25675), (869, 23725), (949, 21725), (1027, 20075), (1825, 11297), (1975, 10439), (3575, 5767), (4015, 5135), (4345, 4745)]