19979818

素因数分解:

$2^1\times {\mathrm{61}}^1\times {\mathrm{389}}^1\times {\mathrm{421}}^1$

素因数の和:873

約数の個数: 16

約数和(自身を含む): 30611880

約数和(自身を除く): 10632062

約数列:

[1, 2, 61, 122, 389, 421, 778, 842, 23729, 25681, 47458, 51362, 163769, 327538, 9989909, 19979818]

約数ペア:

[(1, 19979818), (2, 9989909), (61, 327538), (122, 163769), (389, 51362), (421, 47458), (778, 25681), (842, 23729)]