21025720

素因数分解:

$2^3\times 5^1\times {\mathrm{97}}^1\times {\mathrm{5419}}^1$

素因数の和:5527

約数の個数: 32

約数和(自身を含む): 47804400

約数和(自身を除く): 26778680

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 97, 194, 388, 485, 776, 970, 1940, 3880, 5419, 10838, 21676, 27095, 43352, 54190, 108380, 216760, 525643, 1051286, 2102572, 2628215, 4205144, 5256430, 10512860, 21025720]

約数ペア:

[(1, 21025720), (2, 10512860), (4, 5256430), (5, 4205144), (8, 2628215), (10, 2102572), (20, 1051286), (40, 525643), (97, 216760), (194, 108380), (388, 54190), (485, 43352), (776, 27095), (970, 21676), (1940, 10838), (3880, 5419)]