19993556

素因数分解:

$2^2\times {\mathrm{11}}^2\times {\mathrm{101}}^1\times {\mathrm{409}}^1$

素因数の和:536

約数の個数: 36

約数和(自身を含む): 38934420

約数和(自身を除く): 18940864

約数列:

[1, 2, 4, 11, 22, 44, 101, 121, 202, 242, 404, 409, 484, 818, 1111, 1636, 2222, 4444, 4499, 8998, 12221, 17996, 24442, 41309, 48884, 49489, 82618, 98978, 165236, 197956, 454399, 908798, 1817596, 4998389, 9996778, 19993556]

約数ペア:

[(1, 19993556), (2, 9996778), (4, 4998389), (11, 1817596), (22, 908798), (44, 454399), (101, 197956), (121, 165236), (202, 98978), (242, 82618), (404, 49489), (409, 48884), (484, 41309), (818, 24442), (1111, 17996), (1636, 12221), (2222, 8998), (4444, 4499)]