20508215

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 31715712

約数和(自身を除く): 11207497

約数列:

[1, 5, 7, 13, 35, 47, 49, 65, 91, 137, 235, 245, 329, 455, 611, 637, 685, 959, 1645, 1781, 2303, 3055, 3185, 4277, 4795, 6439, 6713, 8905, 11515, 12467, 21385, 29939, 32195, 33565, 45073, 62335, 83707, 87269, 149695, 225365, 315511, 418535, 436345, 585949, 1577555, 2929745, 4101643, 20508215]

約数ペア:

[(1, 20508215), (5, 4101643), (7, 2929745), (13, 1577555), (35, 585949), (47, 436345), (49, 418535), (65, 315511), (91, 225365), (137, 149695), (235, 87269), (245, 83707), (329, 62335), (455, 45073), (611, 33565), (637, 32195), (685, 29939), (959, 21385), (1645, 12467), (1781, 11515), (2303, 8905), (3055, 6713), (3185, 6439), (4277, 4795)]