19999903

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{23}}^2\times {\mathrm{491}}^1$

素因数の和:555

約数の個数: 24

約数和(自身を含む): 26119296

約数和(自身を除く): 6119393

約数列:

[1, 7, 11, 23, 77, 161, 253, 491, 529, 1771, 3437, 3703, 5401, 5819, 11293, 37807, 40733, 79051, 124223, 259739, 869561, 1818173, 2857129, 19999903]

約数ペア:

[(1, 19999903), (7, 2857129), (11, 1818173), (23, 869561), (77, 259739), (161, 124223), (253, 79051), (491, 40733), (529, 37807), (1771, 11293), (3437, 5819), (3703, 5401)]