21340

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97}}^1$

素因数の和:117

約数の個数: 24

約数和(自身を含む): 49392

約数和(自身を除く): 28052

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 97, 110, 194, 220, 388, 485, 970, 1067, 1940, 2134, 4268, 5335, 10670, 21340]

約数ペア:

[(1, 21340), (2, 10670), (4, 5335), (5, 4268), (10, 2134), (11, 1940), (20, 1067), (22, 970), (44, 485), (55, 388), (97, 220), (110, 194)]