21368721

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{37}}^2\times {\mathrm{43}}^1$

素因数の和:142

約数の個数: 36

約数和(自身を含む): 32935056

約数和(自身を除く): 11566335

約数列:

[1, 3, 11, 33, 37, 43, 111, 121, 129, 363, 407, 473, 1221, 1369, 1419, 1591, 4107, 4477, 4773, 5203, 13431, 15059, 15609, 17501, 45177, 52503, 58867, 165649, 176601, 192511, 496947, 577533, 647537, 1942611, 7122907, 21368721]

約数ペア:

[(1, 21368721), (3, 7122907), (11, 1942611), (33, 647537), (37, 577533), (43, 496947), (111, 192511), (121, 176601), (129, 165649), (363, 58867), (407, 52503), (473, 45177), (1221, 17501), (1369, 15609), (1419, 15059), (1591, 13431), (4107, 5203), (4477, 4773)]