21381640

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10909}}^1$

素因数の和:10934

約数の個数: 48

約数和(自身を含む): 55968300

約数和(自身を除く): 34586660

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10909, 21818, 43636, 54545, 76363, 87272, 109090, 152726, 218180, 305452, 381815, 436360, 534541, 610904, 763630, 1069082, 1527260, 2138164, 2672705, 3054520, 4276328, 5345410, 10690820, 21381640]

約数ペア:

[(1, 21381640), (2, 10690820), (4, 5345410), (5, 4276328), (7, 3054520), (8, 2672705), (10, 2138164), (14, 1527260), (20, 1069082), (28, 763630), (35, 610904), (40, 534541), (49, 436360), (56, 381815), (70, 305452), (98, 218180), (140, 152726), (196, 109090), (245, 87272), (280, 76363), (392, 54545), (490, 43636), (980, 21818), (1960, 10909)]