21042515

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{139}}^1$

素因数の和:311

約数の個数: 32

約数和(自身を含む): 29211840

約数和(自身を除く): 8169325

約数列:

[1, 5, 13, 17, 65, 85, 137, 139, 221, 685, 695, 1105, 1781, 1807, 2329, 2363, 8905, 9035, 11645, 11815, 19043, 30277, 30719, 95215, 151385, 153595, 247559, 323731, 1237795, 1618655, 4208503, 21042515]

約数ペア:

[(1, 21042515), (5, 4208503), (13, 1618655), (17, 1237795), (65, 323731), (85, 247559), (137, 153595), (139, 151385), (221, 95215), (685, 30719), (695, 30277), (1105, 19043), (1781, 11815), (1807, 11645), (2329, 9035), (2363, 8905)]