19963775

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{61}}^1$

素因数の和:156

約数の個数: 48

約数和(自身を含む): 29060640

約数和(自身を除く): 9096865

約数列:

[1, 5, 13, 19, 25, 53, 61, 65, 95, 247, 265, 305, 325, 475, 689, 793, 1007, 1159, 1235, 1325, 1525, 3233, 3445, 3965, 5035, 5795, 6175, 13091, 15067, 16165, 17225, 19825, 25175, 28975, 42029, 61427, 65455, 75335, 80825, 210145, 307135, 327275, 376675, 798551, 1050725, 1535675, 3992755, 19963775]

約数ペア:

[(1, 19963775), (5, 3992755), (13, 1535675), (19, 1050725), (25, 798551), (53, 376675), (61, 327275), (65, 307135), (95, 210145), (247, 80825), (265, 75335), (305, 65455), (325, 61427), (475, 42029), (689, 28975), (793, 25175), (1007, 19825), (1159, 17225), (1235, 16165), (1325, 15067), (1525, 13091), (3233, 6175), (3445, 5795), (3965, 5035)]