81405380

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{18757}}^1$

素因数の和:18804

約数の個数: 48

約数和(自身を含む): 201686016

約数和(自身を除く): 120280636

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 18757, 37514, 75028, 93785, 131299, 187570, 262598, 375140, 525196, 581467, 656495, 1162934, 1312990, 2325868, 2625980, 2907335, 4070269, 5814670, 8140538, 11629340, 16281076, 20351345, 40702690, 81405380]

約数ペア:

[(1, 81405380), (2, 40702690), (4, 20351345), (5, 16281076), (7, 11629340), (10, 8140538), (14, 5814670), (20, 4070269), (28, 2907335), (31, 2625980), (35, 2325868), (62, 1312990), (70, 1162934), (124, 656495), (140, 581467), (155, 525196), (217, 375140), (310, 262598), (434, 187570), (620, 131299), (868, 93785), (1085, 75028), (2170, 37514), (4340, 18757)]