20901925

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^2\times {\mathrm{263}}^1$

素因数の和:318

約数の個数: 36

約数和(自身を含む): 30149856

約数和(自身を除く): 9247931

約数列:

[1, 5, 11, 17, 25, 55, 85, 187, 263, 275, 289, 425, 935, 1315, 1445, 2893, 3179, 4471, 4675, 6575, 7225, 14465, 15895, 22355, 49181, 72325, 76007, 79475, 111775, 245905, 380035, 836077, 1229525, 1900175, 4180385, 20901925]

約数ペア:

[(1, 20901925), (5, 4180385), (11, 1900175), (17, 1229525), (25, 836077), (55, 380035), (85, 245905), (187, 111775), (263, 79475), (275, 76007), (289, 72325), (425, 49181), (935, 22355), (1315, 15895), (1445, 14465), (2893, 7225), (3179, 6575), (4471, 4675)]