21987185

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{149}}^1\times {\mathrm{2683}}^1$

素因数の和:2848

約数の個数: 16

約数和(自身を含む): 28987200

約数和(自身を除く): 7000015

約数列:

[1, 5, 11, 55, 149, 745, 1639, 2683, 8195, 13415, 29513, 147565, 399767, 1998835, 4397437, 21987185]

約数ペア:

[(1, 21987185), (5, 4397437), (11, 1998835), (55, 399767), (149, 147565), (745, 29513), (1639, 13415), (2683, 8195)]