21000578417

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{1579}}^1\times {\mathrm{20879}}^1$

素因数の和:22485

約数の個数: 24

約数和(自身を含む): 26326339200

約数和(自身を除く): 5325760783

約数列:

[1, 7, 13, 49, 91, 637, 1579, 11053, 20527, 20879, 77371, 143689, 146153, 271427, 1005823, 1023071, 1899989, 13299923, 32967941, 230775587, 428583233, 1615429109, 3000082631, 21000578417]

約数ペア:

[(1, 21000578417), (7, 3000082631), (13, 1615429109), (49, 428583233), (91, 230775587), (637, 32967941), (1579, 13299923), (11053, 1899989), (20527, 1023071), (20879, 1005823), (77371, 271427), (143689, 146153)]