20749785

素因数分解:

$3^1\times 5^1\times 7^3\times {\mathrm{37}}^1\times {\mathrm{109}}^1$

素因数の和:175

約数の個数: 64

約数和(自身を含む): 40128000

約数和(自身を除く): 19378215

約数列:

[1, 3, 5, 7, 15, 21, 35, 37, 49, 105, 109, 111, 147, 185, 245, 259, 327, 343, 545, 555, 735, 763, 777, 1029, 1295, 1635, 1715, 1813, 2289, 3815, 3885, 4033, 5145, 5341, 5439, 9065, 11445, 12099, 12691, 16023, 20165, 26705, 27195, 28231, 37387, 38073, 60495, 63455, 80115, 84693, 112161, 141155, 186935, 190365, 197617, 423465, 560805, 592851, 988085, 1383319, 2964255, 4149957, 6916595, 20749785]

約数ペア:

[(1, 20749785), (3, 6916595), (5, 4149957), (7, 2964255), (15, 1383319), (21, 988085), (35, 592851), (37, 560805), (49, 423465), (105, 197617), (109, 190365), (111, 186935), (147, 141155), (185, 112161), (245, 84693), (259, 80115), (327, 63455), (343, 60495), (545, 38073), (555, 37387), (735, 28231), (763, 27195), (777, 26705), (1029, 20165), (1295, 16023), (1635, 12691), (1715, 12099), (1813, 11445), (2289, 9065), (3815, 5439), (3885, 5341), (4033, 5145)]