20985481

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1$

素因数の和:181

約数の個数: 32

約数和(自身を含む): 25804800

約数和(自身を除く): 4819319

約数列:

[1, 11, 19, 31, 41, 79, 209, 341, 451, 589, 779, 869, 1271, 1501, 2449, 3239, 6479, 8569, 13981, 16511, 24149, 26939, 35629, 46531, 61541, 100409, 265639, 511841, 676951, 1104499, 1907771, 20985481]

約数ペア:

[(1, 20985481), (11, 1907771), (19, 1104499), (31, 676951), (41, 511841), (79, 265639), (209, 100409), (341, 61541), (451, 46531), (589, 35629), (779, 26939), (869, 24149), (1271, 16511), (1501, 13981), (2449, 8569), (3239, 6479)]