1281380

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{811}}^1$

素因数の和:899

約数の個数: 24

約数和(自身を含む): 2728320

約数和(自身を除く): 1446940

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 811, 1580, 1622, 3244, 4055, 8110, 16220, 64069, 128138, 256276, 320345, 640690, 1281380]

約数ペア:

[(1, 1281380), (2, 640690), (4, 320345), (5, 256276), (10, 128138), (20, 64069), (79, 16220), (158, 8110), (316, 4055), (395, 3244), (790, 1622), (811, 1580)]