639821

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:188

約数の個数: 16

約数和(自身を含む): 806400

約数和(自身を除く): 166579

約数列:

[1, 7, 13, 79, 89, 91, 553, 623, 1027, 1157, 7031, 7189, 8099, 49217, 91403, 639821]

約数ペア:

[(1, 639821), (7, 91403), (13, 49217), (79, 8099), (89, 7189), (91, 7031), (553, 1157), (623, 1027)]