21253580

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25919}}^1$

素因数の和:25969

約数の個数: 24

約数和(自身を含む): 45722880

約数和(自身を除く): 24469300

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25919, 51838, 103676, 129595, 259190, 518380, 1062679, 2125358, 4250716, 5313395, 10626790, 21253580]

約数ペア:

[(1, 21253580), (2, 10626790), (4, 5313395), (5, 4250716), (10, 2125358), (20, 1062679), (41, 518380), (82, 259190), (164, 129595), (205, 103676), (410, 51838), (820, 25919)]