21218421

素因数分解:

$3^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1$

素因数の和:214

約数の個数: 48

約数和(自身を含む): 35458560

約数和(自身を除く): 14240139

約数列:

[1, 3, 7, 19, 21, 49, 57, 71, 107, 133, 147, 213, 321, 399, 497, 749, 931, 1349, 1491, 2033, 2247, 2793, 3479, 4047, 5243, 6099, 7597, 9443, 10437, 14231, 15729, 22791, 28329, 42693, 53179, 66101, 99617, 144343, 159537, 198303, 298851, 372253, 433029, 1010401, 1116759, 3031203, 7072807, 21218421]

約数ペア:

[(1, 21218421), (3, 7072807), (7, 3031203), (19, 1116759), (21, 1010401), (49, 433029), (57, 372253), (71, 298851), (107, 198303), (133, 159537), (147, 144343), (213, 99617), (321, 66101), (399, 53179), (497, 42693), (749, 28329), (931, 22791), (1349, 15729), (1491, 14231), (2033, 10437), (2247, 9443), (2793, 7597), (3479, 6099), (4047, 5243)]