20991381

素因数分解:

$3^1\times {\mathrm{61}}^1\times {\mathrm{251}}^1\times {\mathrm{457}}^1$

素因数の和:772

約数の個数: 16

約数和(自身を含む): 28623168

約数和(自身を除く): 7631787

約数列:

[1, 3, 61, 183, 251, 457, 753, 1371, 15311, 27877, 45933, 83631, 114707, 344121, 6997127, 20991381]

約数ペア:

[(1, 20991381), (3, 6997127), (61, 344121), (183, 114707), (251, 83631), (457, 45933), (753, 27877), (1371, 15311)]