81387320

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{290669}}^1$

素因数の和:290687

約数の個数: 32

約数和(自身を含む): 209282400

約数和(自身を除く): 127895080

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 290669, 581338, 1162676, 1453345, 2034683, 2325352, 2906690, 4069366, 5813380, 8138732, 10173415, 11626760, 16277464, 20346830, 40693660, 81387320]

約数ペア:

[(1, 81387320), (2, 40693660), (4, 20346830), (5, 16277464), (7, 11626760), (8, 10173415), (10, 8138732), (14, 5813380), (20, 4069366), (28, 2906690), (35, 2325352), (40, 2034683), (56, 1453345), (70, 1162676), (140, 581338), (280, 290669)]