21263840

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{10223}}^1$

素因数の和:10251

約数の個数: 48

約数和(自身を含む): 54105408

約数和(自身を除く): 32841568

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 10223, 20446, 40892, 51115, 81784, 102230, 132899, 163568, 204460, 265798, 327136, 408920, 531596, 664495, 817840, 1063192, 1328990, 1635680, 2126384, 2657980, 4252768, 5315960, 10631920, 21263840]

約数ペア:

[(1, 21263840), (2, 10631920), (4, 5315960), (5, 4252768), (8, 2657980), (10, 2126384), (13, 1635680), (16, 1328990), (20, 1063192), (26, 817840), (32, 664495), (40, 531596), (52, 408920), (65, 327136), (80, 265798), (104, 204460), (130, 163568), (160, 132899), (208, 102230), (260, 81784), (416, 51115), (520, 40892), (1040, 20446), (2080, 10223)]