20993245

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1$

素因数の和:134

約数の個数: 64

約数和(自身を含む): 33707520

約数和(自身を除く): 12714275

約数列:

[1, 5, 7, 13, 29, 35, 37, 43, 65, 91, 145, 185, 203, 215, 259, 301, 377, 455, 481, 559, 1015, 1073, 1247, 1295, 1505, 1591, 1885, 2405, 2639, 2795, 3367, 3913, 5365, 6235, 7511, 7955, 8729, 11137, 13195, 13949, 16211, 16835, 19565, 20683, 37555, 43645, 46139, 55685, 69745, 81055, 97643, 103415, 113477, 144781, 230695, 322973, 488215, 567385, 599807, 723905, 1614865, 2999035, 4198649, 20993245]

約数ペア:

[(1, 20993245), (5, 4198649), (7, 2999035), (13, 1614865), (29, 723905), (35, 599807), (37, 567385), (43, 488215), (65, 322973), (91, 230695), (145, 144781), (185, 113477), (203, 103415), (215, 97643), (259, 81055), (301, 69745), (377, 55685), (455, 46139), (481, 43645), (559, 37555), (1015, 20683), (1073, 19565), (1247, 16835), (1295, 16211), (1505, 13949), (1591, 13195), (1885, 11137), (2405, 8729), (2639, 7955), (2795, 7511), (3367, 6235), (3913, 5365)]