21351057

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{197}}^1\times {\mathrm{397}}^1$

素因数の和:617

約数の個数: 32

約数和(自身を含む): 35304192

約数和(自身を除く): 13953135

約数列:

[1, 3, 7, 13, 21, 39, 91, 197, 273, 397, 591, 1191, 1379, 2561, 2779, 4137, 5161, 7683, 8337, 15483, 17927, 36127, 53781, 78209, 108381, 234627, 547463, 1016717, 1642389, 3050151, 7117019, 21351057]

約数ペア:

[(1, 21351057), (3, 7117019), (7, 3050151), (13, 1642389), (21, 1016717), (39, 547463), (91, 234627), (197, 108381), (273, 78209), (397, 53781), (591, 36127), (1191, 17927), (1379, 15483), (2561, 8337), (2779, 7683), (4137, 5161)]