21257876

素因数分解:

$2^2\times {\mathrm{53}}^1\times {\mathrm{197}}^1\times {\mathrm{509}}^1$

素因数の和:763

約数の個数: 24

約数和(自身を含む): 38170440

約数和(自身を除く): 16912564

約数列:

[1, 2, 4, 53, 106, 197, 212, 394, 509, 788, 1018, 2036, 10441, 20882, 26977, 41764, 53954, 100273, 107908, 200546, 401092, 5314469, 10628938, 21257876]

約数ペア:

[(1, 21257876), (2, 10628938), (4, 5314469), (53, 401092), (106, 200546), (197, 107908), (212, 100273), (394, 53954), (509, 41764), (788, 26977), (1018, 20882), (2036, 10441)]