20754965

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:138

約数の個数: 64

約数和(自身を含む): 33619968

約数和(自身を除く): 12865003

約数列:

[1, 5, 7, 11, 31, 35, 37, 47, 55, 77, 155, 185, 217, 235, 259, 329, 341, 385, 407, 517, 1085, 1147, 1295, 1457, 1645, 1705, 1739, 2035, 2387, 2585, 2849, 3619, 5735, 7285, 8029, 8695, 10199, 11935, 12173, 12617, 14245, 16027, 18095, 19129, 40145, 50995, 53909, 60865, 63085, 80135, 88319, 95645, 112189, 133903, 269545, 377363, 441595, 560945, 592999, 669515, 1886815, 2964995, 4150993, 20754965]

約数ペア:

[(1, 20754965), (5, 4150993), (7, 2964995), (11, 1886815), (31, 669515), (35, 592999), (37, 560945), (47, 441595), (55, 377363), (77, 269545), (155, 133903), (185, 112189), (217, 95645), (235, 88319), (259, 80135), (329, 63085), (341, 60865), (385, 53909), (407, 50995), (517, 40145), (1085, 19129), (1147, 18095), (1295, 16027), (1457, 14245), (1645, 12617), (1705, 12173), (1739, 11935), (2035, 10199), (2387, 8695), (2585, 8029), (2849, 7285), (3619, 5735)]