20991219

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{3259}}^1$

素因数の和:3394

約数の個数: 16

約数和(自身を含む): 29731200

約数和(自身を除く): 8739981

約数列:

[1, 3, 19, 57, 113, 339, 2147, 3259, 6441, 9777, 61921, 185763, 368267, 1104801, 6997073, 20991219]

約数ペア:

[(1, 20991219), (3, 6997073), (19, 1104801), (57, 368267), (113, 185763), (339, 61921), (2147, 9777), (3259, 6441)]