19778915

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{89}}^1\times {\mathrm{263}}^1$

素因数の和:383

約数の個数: 24

約数和(自身を含む): 26088480

約数和(自身を除く): 6309565

約数列:

[1, 5, 13, 65, 89, 169, 263, 445, 845, 1157, 1315, 3419, 5785, 15041, 17095, 23407, 44447, 75205, 117035, 222235, 304291, 1521455, 3955783, 19778915]

約数ペア:

[(1, 19778915), (5, 3955783), (13, 1521455), (65, 304291), (89, 222235), (169, 117035), (263, 75205), (445, 44447), (845, 23407), (1157, 17095), (1315, 15041), (3419, 5785)]