21285520

素因数分解:

$2^4\times 5^1\times {\mathrm{109}}^1\times {\mathrm{2441}}^1$

素因数の和:2563

約数の個数: 40

約数和(自身を含む): 49963320

約数和(自身を除く): 28677800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 109, 218, 436, 545, 872, 1090, 1744, 2180, 2441, 4360, 4882, 8720, 9764, 12205, 19528, 24410, 39056, 48820, 97640, 195280, 266069, 532138, 1064276, 1330345, 2128552, 2660690, 4257104, 5321380, 10642760, 21285520]

約数ペア:

[(1, 21285520), (2, 10642760), (4, 5321380), (5, 4257104), (8, 2660690), (10, 2128552), (16, 1330345), (20, 1064276), (40, 532138), (80, 266069), (109, 195280), (218, 97640), (436, 48820), (545, 39056), (872, 24410), (1090, 19528), (1744, 12205), (2180, 9764), (2441, 8720), (4360, 4882)]