20491280

素因数分解:

$2^4\times 5^1\times {\mathrm{67}}^1\times {\mathrm{3823}}^1$

素因数の和:3903

約数の個数: 40

約数和(自身を含む): 48365952

約数和(自身を除く): 27874672

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 67, 80, 134, 268, 335, 536, 670, 1072, 1340, 2680, 3823, 5360, 7646, 15292, 19115, 30584, 38230, 61168, 76460, 152920, 256141, 305840, 512282, 1024564, 1280705, 2049128, 2561410, 4098256, 5122820, 10245640, 20491280]

約数ペア:

[(1, 20491280), (2, 10245640), (4, 5122820), (5, 4098256), (8, 2561410), (10, 2049128), (16, 1280705), (20, 1024564), (40, 512282), (67, 305840), (80, 256141), (134, 152920), (268, 76460), (335, 61168), (536, 38230), (670, 30584), (1072, 19115), (1340, 15292), (2680, 7646), (3823, 5360)]