21235851

素因数分解:

$3^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{67}}^1$

素因数の和:142

約数の個数: 80

約数和(自身を含む): 40547584

約数和(自身を除く): 19311733

約数列:

[1, 3, 7, 9, 13, 21, 27, 39, 43, 63, 67, 81, 91, 117, 129, 189, 201, 273, 301, 351, 387, 469, 559, 567, 603, 819, 871, 903, 1053, 1161, 1407, 1677, 1809, 2457, 2613, 2709, 2881, 3483, 3913, 4221, 5031, 5427, 6097, 7371, 7839, 8127, 8643, 11739, 12663, 15093, 18291, 20167, 23517, 24381, 25929, 35217, 37453, 37989, 45279, 54873, 60501, 70551, 77787, 105651, 112359, 164619, 181503, 233361, 262171, 316953, 337077, 493857, 544509, 786513, 1011231, 1633527, 2359539, 3033693, 7078617, 21235851]

約数ペア:

[(1, 21235851), (3, 7078617), (7, 3033693), (9, 2359539), (13, 1633527), (21, 1011231), (27, 786513), (39, 544509), (43, 493857), (63, 337077), (67, 316953), (81, 262171), (91, 233361), (117, 181503), (129, 164619), (189, 112359), (201, 105651), (273, 77787), (301, 70551), (351, 60501), (387, 54873), (469, 45279), (559, 37989), (567, 37453), (603, 35217), (819, 25929), (871, 24381), (903, 23517), (1053, 20167), (1161, 18291), (1407, 15093), (1677, 12663), (1809, 11739), (2457, 8643), (2613, 8127), (2709, 7839), (2881, 7371), (3483, 6097), (3913, 5427), (4221, 5031)]