20819825

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{47}}^2$

素因数の和:146

約数の個数: 36

約数和(自身を含む): 29386140

約数和(自身を除く): 8566315

約数列:

[1, 5, 13, 25, 29, 47, 65, 145, 235, 325, 377, 611, 725, 1175, 1363, 1885, 2209, 3055, 6815, 9425, 11045, 15275, 17719, 28717, 34075, 55225, 64061, 88595, 143585, 320305, 442975, 717925, 832793, 1601525, 4163965, 20819825]

約数ペア:

[(1, 20819825), (5, 4163965), (13, 1601525), (25, 832793), (29, 717925), (47, 442975), (65, 320305), (145, 143585), (235, 88595), (325, 64061), (377, 55225), (611, 34075), (725, 28717), (1175, 17719), (1363, 15275), (1885, 11045), (2209, 9425), (3055, 6815)]