21394520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{701}}^1$

素因数の和:828

約数の個数: 64

約数和(自身を含む): 55598400

約数和(自身を除く): 34203880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 109, 140, 218, 280, 436, 545, 701, 763, 872, 1090, 1402, 1526, 2180, 2804, 3052, 3505, 3815, 4360, 4907, 5608, 6104, 7010, 7630, 9814, 14020, 15260, 19628, 24535, 28040, 30520, 39256, 49070, 76409, 98140, 152818, 196280, 305636, 382045, 534863, 611272, 764090, 1069726, 1528180, 2139452, 2674315, 3056360, 4278904, 5348630, 10697260, 21394520]

約数ペア:

[(1, 21394520), (2, 10697260), (4, 5348630), (5, 4278904), (7, 3056360), (8, 2674315), (10, 2139452), (14, 1528180), (20, 1069726), (28, 764090), (35, 611272), (40, 534863), (56, 382045), (70, 305636), (109, 196280), (140, 152818), (218, 98140), (280, 76409), (436, 49070), (545, 39256), (701, 30520), (763, 28040), (872, 24535), (1090, 19628), (1402, 15260), (1526, 14020), (2180, 9814), (2804, 7630), (3052, 7010), (3505, 6104), (3815, 5608), (4360, 4907)]