21638680

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{709}}^1$

素因数の和:836

約数の個数: 64

約数和(自身を含む): 56232000

約数和(自身を除く): 34593320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 109, 140, 218, 280, 436, 545, 709, 763, 872, 1090, 1418, 1526, 2180, 2836, 3052, 3545, 3815, 4360, 4963, 5672, 6104, 7090, 7630, 9926, 14180, 15260, 19852, 24815, 28360, 30520, 39704, 49630, 77281, 99260, 154562, 198520, 309124, 386405, 540967, 618248, 772810, 1081934, 1545620, 2163868, 2704835, 3091240, 4327736, 5409670, 10819340, 21638680]

約数ペア:

[(1, 21638680), (2, 10819340), (4, 5409670), (5, 4327736), (7, 3091240), (8, 2704835), (10, 2163868), (14, 1545620), (20, 1081934), (28, 772810), (35, 618248), (40, 540967), (56, 386405), (70, 309124), (109, 198520), (140, 154562), (218, 99260), (280, 77281), (436, 49630), (545, 39704), (709, 30520), (763, 28360), (872, 24815), (1090, 19852), (1418, 15260), (1526, 14180), (2180, 9926), (2836, 7630), (3052, 7090), (3545, 6104), (3815, 5672), (4360, 4963)]