21320780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82003}}^1$

素因数の和:82025

約数の個数: 24

約数和(自身を含む): 48218352

約数和(自身を除く): 26897572

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82003, 164006, 328012, 410015, 820030, 1066039, 1640060, 2132078, 4264156, 5330195, 10660390, 21320780]

約数ペア:

[(1, 21320780), (2, 10660390), (4, 5330195), (5, 4264156), (10, 2132078), (13, 1640060), (20, 1066039), (26, 820030), (52, 410015), (65, 328012), (130, 164006), (260, 82003)]