21380680

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{13037}}^1$

素因数の和:13089

約数の個数: 32

約数和(自身を含む): 49283640

約数和(自身を除く): 27902960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 13037, 26074, 52148, 65185, 104296, 130370, 260740, 521480, 534517, 1069034, 2138068, 2672585, 4276136, 5345170, 10690340, 21380680]

約数ペア:

[(1, 21380680), (2, 10690340), (4, 5345170), (5, 4276136), (8, 2672585), (10, 2138068), (20, 1069034), (40, 534517), (41, 521480), (82, 260740), (164, 130370), (205, 104296), (328, 65185), (410, 52148), (820, 26074), (1640, 13037)]