20778320

素因数分解:

$2^4\times 5^1\times {\mathrm{179}}^1\times {\mathrm{1451}}^1$

素因数の和:1643

約数の個数: 40

約数和(自身を含む): 48612960

約数和(自身を除く): 27834640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 179, 358, 716, 895, 1432, 1451, 1790, 2864, 2902, 3580, 5804, 7160, 7255, 11608, 14320, 14510, 23216, 29020, 58040, 116080, 259729, 519458, 1038916, 1298645, 2077832, 2597290, 4155664, 5194580, 10389160, 20778320]

約数ペア:

[(1, 20778320), (2, 10389160), (4, 5194580), (5, 4155664), (8, 2597290), (10, 2077832), (16, 1298645), (20, 1038916), (40, 519458), (80, 259729), (179, 116080), (358, 58040), (716, 29020), (895, 23216), (1432, 14510), (1451, 14320), (1790, 11608), (2864, 7255), (2902, 7160), (3580, 5804)]