21287721

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{77977}}^1$

素因数の和:78000

約数の個数: 16

約数和(自身を含む): 34934144

約数和(自身を除く): 13646423

約数列:

[1, 3, 7, 13, 21, 39, 91, 273, 77977, 233931, 545839, 1013701, 1637517, 3041103, 7095907, 21287721]

約数ペア:

[(1, 21287721), (3, 7095907), (7, 3041103), (13, 1637517), (21, 1013701), (39, 545839), (91, 233931), (273, 77977)]