21191972

素因数分解:

$2^2\times {\mathrm{31}}^2\times {\mathrm{37}}^1\times {\mathrm{149}}^1$

素因数の和:252

約数の個数: 36

約数和(自身を含む): 39620700

約数和(自身を除く): 18428728

約数列:

[1, 2, 4, 31, 37, 62, 74, 124, 148, 149, 298, 596, 961, 1147, 1922, 2294, 3844, 4588, 4619, 5513, 9238, 11026, 18476, 22052, 35557, 71114, 142228, 143189, 170903, 286378, 341806, 572756, 683612, 5297993, 10595986, 21191972]

約数ペア:

[(1, 21191972), (2, 10595986), (4, 5297993), (31, 683612), (37, 572756), (62, 341806), (74, 286378), (124, 170903), (148, 143189), (149, 142228), (298, 71114), (596, 35557), (961, 22052), (1147, 18476), (1922, 11026), (2294, 9238), (3844, 5513), (4588, 4619)]