20991945

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{1297}}^1$

素因数の和:1401

約数の個数: 32

約数和(自身を含む): 36634752

約数和(自身を除く): 15642807

約数列:

[1, 3, 5, 13, 15, 39, 65, 83, 195, 249, 415, 1079, 1245, 1297, 3237, 3891, 5395, 6485, 16185, 16861, 19455, 50583, 84305, 107651, 252915, 322953, 538255, 1399463, 1614765, 4198389, 6997315, 20991945]

約数ペア:

[(1, 20991945), (3, 6997315), (5, 4198389), (13, 1614765), (15, 1399463), (39, 538255), (65, 322953), (83, 252915), (195, 107651), (249, 84305), (415, 50583), (1079, 19455), (1245, 16861), (1297, 16185), (3237, 6485), (3891, 5395)]