21220840

素因数分解:

$2^3\times 5^1\times {\mathrm{197}}^1\times {\mathrm{2693}}^1$

素因数の和:2901

約数の個数: 32

約数和(自身を含む): 48007080

約数和(自身を除く): 26786240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 197, 394, 788, 985, 1576, 1970, 2693, 3940, 5386, 7880, 10772, 13465, 21544, 26930, 53860, 107720, 530521, 1061042, 2122084, 2652605, 4244168, 5305210, 10610420, 21220840]

約数ペア:

[(1, 21220840), (2, 10610420), (4, 5305210), (5, 4244168), (8, 2652605), (10, 2122084), (20, 1061042), (40, 530521), (197, 107720), (394, 53860), (788, 26930), (985, 21544), (1576, 13465), (1970, 10772), (2693, 7880), (3940, 5386)]