640325270

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{397}}^1\times {\mathrm{653}}^1$

素因数の和:1089

約数の個数: 64

約数和(自身を含む): 1311871680

約数和(自身を除く): 671546410

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 65, 95, 130, 190, 247, 397, 494, 653, 794, 1235, 1306, 1985, 2470, 3265, 3970, 5161, 6530, 7543, 8489, 10322, 12407, 15086, 16978, 24814, 25805, 37715, 42445, 51610, 62035, 75430, 84890, 98059, 124070, 161291, 196118, 259241, 322582, 490295, 518482, 806455, 980590, 1296205, 1612910, 2592410, 3370133, 4925579, 6740266, 9851158, 16850665, 24627895, 33701330, 49255790, 64032527, 128065054, 320162635, 640325270]

約数ペア:

[(1, 640325270), (2, 320162635), (5, 128065054), (10, 64032527), (13, 49255790), (19, 33701330), (26, 24627895), (38, 16850665), (65, 9851158), (95, 6740266), (130, 4925579), (190, 3370133), (247, 2592410), (397, 1612910), (494, 1296205), (653, 980590), (794, 806455), (1235, 518482), (1306, 490295), (1985, 322582), (2470, 259241), (3265, 196118), (3970, 161291), (5161, 124070), (6530, 98059), (7543, 84890), (8489, 75430), (10322, 62035), (12407, 51610), (15086, 42445), (16978, 37715), (24814, 25805)]