21378819

素因数分解:

$3^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{4871}}^1$

素因数の和:4911

約数の個数: 32

約数和(自身を含む): 37416960

約数和(自身を除く): 16038141

約数列:

[1, 3, 7, 11, 19, 21, 33, 57, 77, 133, 209, 231, 399, 627, 1463, 4389, 4871, 14613, 34097, 53581, 92549, 102291, 160743, 277647, 375067, 647843, 1018039, 1125201, 1943529, 3054117, 7126273, 21378819]

約数ペア:

[(1, 21378819), (3, 7126273), (7, 3054117), (11, 1943529), (19, 1125201), (21, 1018039), (33, 647843), (57, 375067), (77, 277647), (133, 160743), (209, 102291), (231, 92549), (399, 53581), (627, 34097), (1463, 14613), (4389, 4871)]