21391359

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{313}}^1$

素因数の和:455

約数の個数: 32

約数和(自身を含む): 33158400

約数和(自身を除く): 11767041

約数列:

[1, 3, 11, 19, 33, 57, 109, 209, 313, 327, 627, 939, 1199, 2071, 3443, 3597, 5947, 6213, 10329, 17841, 22781, 34117, 65417, 68343, 102351, 196251, 375287, 648223, 1125861, 1944669, 7130453, 21391359]

約数ペア:

[(1, 21391359), (3, 7130453), (11, 1944669), (19, 1125861), (33, 648223), (57, 375287), (109, 196251), (209, 102351), (313, 68343), (327, 65417), (627, 34117), (939, 22781), (1199, 17841), (2071, 10329), (3443, 6213), (3597, 5947)]