19981391

素因数分解:

${\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1$

素因数の和:350

約数の個数: 16

約数和(自身を含む): 21504000

約数和(自身を除く): 1522609

約数列:

[1, 31, 41, 79, 199, 1271, 2449, 3239, 6169, 8159, 15721, 100409, 252929, 487351, 644561, 19981391]

約数ペア:

[(1, 19981391), (31, 644561), (41, 487351), (79, 252929), (199, 100409), (1271, 15721), (2449, 8159), (3239, 6169)]