18659920

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{5689}}^1$

素因数の和:5743

約数の個数: 40

約数和(自身を含む): 44450280

約数和(自身を除く): 25790360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 5689, 11378, 22756, 28445, 45512, 56890, 91024, 113780, 227560, 233249, 455120, 466498, 932996, 1166245, 1865992, 2332490, 3731984, 4664980, 9329960, 18659920]

約数ペア:

[(1, 18659920), (2, 9329960), (4, 4664980), (5, 3731984), (8, 2332490), (10, 1865992), (16, 1166245), (20, 932996), (40, 466498), (41, 455120), (80, 233249), (82, 227560), (164, 113780), (205, 91024), (328, 56890), (410, 45512), (656, 28445), (820, 22756), (1640, 11378), (3280, 5689)]