81217780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{1607}}^1$

素因数の和:1661

約数の個数: 72

約数和(自身を含む): 205849728

約数和(自身を除く): 124631948

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 70, 76, 95, 133, 140, 190, 266, 361, 380, 532, 665, 722, 1330, 1444, 1607, 1805, 2527, 2660, 3214, 3610, 5054, 6428, 7220, 8035, 10108, 11249, 12635, 16070, 22498, 25270, 30533, 32140, 44996, 50540, 56245, 61066, 112490, 122132, 152665, 213731, 224980, 305330, 427462, 580127, 610660, 854924, 1068655, 1160254, 2137310, 2320508, 2900635, 4060889, 4274620, 5801270, 8121778, 11602540, 16243556, 20304445, 40608890, 81217780]

約数ペア:

[(1, 81217780), (2, 40608890), (4, 20304445), (5, 16243556), (7, 11602540), (10, 8121778), (14, 5801270), (19, 4274620), (20, 4060889), (28, 2900635), (35, 2320508), (38, 2137310), (70, 1160254), (76, 1068655), (95, 854924), (133, 610660), (140, 580127), (190, 427462), (266, 305330), (361, 224980), (380, 213731), (532, 152665), (665, 122132), (722, 112490), (1330, 61066), (1444, 56245), (1607, 50540), (1805, 44996), (2527, 32140), (2660, 30533), (3214, 25270), (3610, 22498), (5054, 16070), (6428, 12635), (7220, 11249), (8035, 10108)]