20691680

素因数分解:

$2^5\times 5^1\times {\mathrm{79}}^1\times {\mathrm{1637}}^1$

素因数の和:1731

約数の個数: 48

約数和(自身を含む): 49533120

約数和(自身を除く): 28841440

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 79, 80, 158, 160, 316, 395, 632, 790, 1264, 1580, 1637, 2528, 3160, 3274, 6320, 6548, 8185, 12640, 13096, 16370, 26192, 32740, 52384, 65480, 129323, 130960, 258646, 261920, 517292, 646615, 1034584, 1293230, 2069168, 2586460, 4138336, 5172920, 10345840, 20691680]

約数ペア:

[(1, 20691680), (2, 10345840), (4, 5172920), (5, 4138336), (8, 2586460), (10, 2069168), (16, 1293230), (20, 1034584), (32, 646615), (40, 517292), (79, 261920), (80, 258646), (158, 130960), (160, 129323), (316, 65480), (395, 52384), (632, 32740), (790, 26192), (1264, 16370), (1580, 13096), (1637, 12640), (2528, 8185), (3160, 6548), (3274, 6320)]