19901553

素因数分解:

$3^1\times 7^1\times {\mathrm{53}}^1\times {\mathrm{17881}}^1$

素因数の和:17944

約数の個数: 16

約数和(自身を含む): 30900096

約数和(自身を除く): 10998543

約数列:

[1, 3, 7, 21, 53, 159, 371, 1113, 17881, 53643, 125167, 375501, 947693, 2843079, 6633851, 19901553]

約数ペア:

[(1, 19901553), (3, 6633851), (7, 2843079), (21, 947693), (53, 375501), (159, 125167), (371, 53643), (1113, 17881)]