640291561

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{113}}^1\times {\mathrm{877}}^1$

素因数の和:1081

約数の個数: 32

約数和(自身を含む): 807141888

約数和(自身を除く): 166850327

約数列:

[1, 7, 13, 71, 91, 113, 497, 791, 877, 923, 1469, 6139, 6461, 8023, 10283, 11401, 56161, 62267, 79807, 99101, 104299, 435869, 693707, 730093, 809471, 1288313, 5666297, 7036171, 9018191, 49253197, 91470223, 640291561]

約数ペア:

[(1, 640291561), (7, 91470223), (13, 49253197), (71, 9018191), (91, 7036171), (113, 5666297), (497, 1288313), (791, 809471), (877, 730093), (923, 693707), (1469, 435869), (6139, 104299), (6461, 99101), (8023, 79807), (10283, 62267), (11401, 56161)]