21990519

素因数分解:

$3^2\times {\mathrm{79}}^1\times {\mathrm{157}}^1\times {\mathrm{197}}^1$

素因数の和:439

約数の個数: 24

約数和(自身を含む): 32535360

約数和(自身を除く): 10544841

約数列:

[1, 3, 9, 79, 157, 197, 237, 471, 591, 711, 1413, 1773, 12403, 15563, 30929, 37209, 46689, 92787, 111627, 140067, 278361, 2443391, 7330173, 21990519]

約数ペア:

[(1, 21990519), (3, 7330173), (9, 2443391), (79, 278361), (157, 140067), (197, 111627), (237, 92787), (471, 46689), (591, 37209), (711, 30929), (1413, 15563), (1773, 12403)]