21104840

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{2053}}^1$

素因数の和:2321

約数の個数: 32

約数和(自身を含む): 47693880

約数和(自身を除く): 26589040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 1028, 1285, 2053, 2056, 2570, 4106, 5140, 8212, 10265, 10280, 16424, 20530, 41060, 82120, 527621, 1055242, 2110484, 2638105, 4220968, 5276210, 10552420, 21104840]

約数ペア:

[(1, 21104840), (2, 10552420), (4, 5276210), (5, 4220968), (8, 2638105), (10, 2110484), (20, 1055242), (40, 527621), (257, 82120), (514, 41060), (1028, 20530), (1285, 16424), (2053, 10280), (2056, 10265), (2570, 8212), (4106, 5140)]