21007945

素因数分解:

$5^1\times 7^1\times {\mathrm{389}}^1\times {\mathrm{1543}}^1$

素因数の和:1944

約数の個数: 16

約数和(自身を含む): 28903680

約数和(自身を除く): 7895735

約数列:

[1, 5, 7, 35, 389, 1543, 1945, 2723, 7715, 10801, 13615, 54005, 600227, 3001135, 4201589, 21007945]

約数ペア:

[(1, 21007945), (5, 4201589), (7, 3001135), (35, 600227), (389, 54005), (1543, 13615), (1945, 10801), (2723, 7715)]