87990721

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{2939}}^1$

素因数の和:3013

約数の個数: 24

約数和(自身を含む): 112613760

約数和(自身を除く): 24623039

約数列:

[1, 7, 13, 47, 49, 91, 329, 611, 637, 2303, 2939, 4277, 20573, 29939, 38207, 138133, 144011, 267449, 966931, 1795729, 1872143, 6768517, 12570103, 87990721]

約数ペア:

[(1, 87990721), (7, 12570103), (13, 6768517), (47, 1872143), (49, 1795729), (91, 966931), (329, 267449), (611, 144011), (637, 138133), (2303, 38207), (2939, 29939), (4277, 20573)]