21457821

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{4889}}^1$

素因数の和:4929

約数の個数: 32

約数和(自身を含む): 37555200

約数和(自身を除く): 16097379

約数列:

[1, 3, 7, 11, 19, 21, 33, 57, 77, 133, 209, 231, 399, 627, 1463, 4389, 4889, 14667, 34223, 53779, 92891, 102669, 161337, 278673, 376453, 650237, 1021801, 1129359, 1950711, 3065403, 7152607, 21457821]

約数ペア:

[(1, 21457821), (3, 7152607), (7, 3065403), (11, 1950711), (19, 1129359), (21, 1021801), (33, 650237), (57, 376453), (77, 278673), (133, 161337), (209, 102669), (231, 92891), (399, 53779), (627, 34223), (1463, 14667), (4389, 4889)]