21020945

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{12329}}^1$

素因数の和:12376

約数の個数: 16

約数和(自身を含む): 28408320

約数和(自身を除く): 7387375

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 12329, 61645, 135619, 382199, 678095, 1910995, 4204189, 21020945]

約数ペア:

[(1, 21020945), (5, 4204189), (11, 1910995), (31, 678095), (55, 382199), (155, 135619), (341, 61645), (1705, 12329)]