21988015

素因数分解:

$5^1\times 7^3\times {\mathrm{12821}}^1$

素因数の和:12847

約数の個数: 16

約数和(自身を含む): 30772800

約数和(自身を除く): 8784785

約数列:

[1, 5, 7, 35, 49, 245, 343, 1715, 12821, 64105, 89747, 448735, 628229, 3141145, 4397603, 21988015]

約数ペア:

[(1, 21988015), (5, 4397603), (7, 3141145), (35, 628229), (49, 448735), (245, 89747), (343, 64105), (1715, 12821)]