21987351

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{1811}}^1$

素因数の和:1907

約数の個数: 24

約数和(自身を含む): 33920640

約数和(自身を除く): 11933289

約数列:

[1, 3, 9, 19, 57, 71, 171, 213, 639, 1349, 1811, 4047, 5433, 12141, 16299, 34409, 103227, 128581, 309681, 385743, 1157229, 2443039, 7329117, 21987351]

約数ペア:

[(1, 21987351), (3, 7329117), (9, 2443039), (19, 1157229), (57, 385743), (71, 309681), (171, 128581), (213, 103227), (639, 34409), (1349, 16299), (1811, 12141), (4047, 5433)]