81987787

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{107}}^1\times {\mathrm{137}}^1$

素因数の和:315

約数の個数: 32

約数和(自身を含む): 103016448

約数和(自身を除く): 21028661

約数列:

[1, 7, 17, 47, 107, 119, 137, 329, 749, 799, 959, 1819, 2329, 5029, 5593, 6439, 12733, 14659, 16303, 35203, 45073, 85493, 102613, 109463, 249203, 598451, 688973, 766241, 1744421, 4822811, 11712541, 81987787]

約数ペア:

[(1, 81987787), (7, 11712541), (17, 4822811), (47, 1744421), (107, 766241), (119, 688973), (137, 598451), (329, 249203), (749, 109463), (799, 102613), (959, 85493), (1819, 45073), (2329, 35203), (5029, 16303), (5593, 14659), (6439, 12733)]