20781904

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{293}}^1$

素因数の和:356

約数の個数: 80

約数和(自身を含む): 48996864

約数和(自身を除く): 28214960

約数列:

[1, 2, 4, 8, 11, 13, 16, 22, 26, 31, 44, 52, 62, 88, 104, 124, 143, 176, 208, 248, 286, 293, 341, 403, 496, 572, 586, 682, 806, 1144, 1172, 1364, 1612, 2288, 2344, 2728, 3223, 3224, 3809, 4433, 4688, 5456, 6446, 6448, 7618, 8866, 9083, 12892, 15236, 17732, 18166, 25784, 30472, 35464, 36332, 41899, 51568, 60944, 70928, 72664, 83798, 99913, 118079, 145328, 167596, 199826, 236158, 335192, 399652, 472316, 670384, 799304, 944632, 1298869, 1598608, 1889264, 2597738, 5195476, 10390952, 20781904]

約数ペア:

[(1, 20781904), (2, 10390952), (4, 5195476), (8, 2597738), (11, 1889264), (13, 1598608), (16, 1298869), (22, 944632), (26, 799304), (31, 670384), (44, 472316), (52, 399652), (62, 335192), (88, 236158), (104, 199826), (124, 167596), (143, 145328), (176, 118079), (208, 99913), (248, 83798), (286, 72664), (293, 70928), (341, 60944), (403, 51568), (496, 41899), (572, 36332), (586, 35464), (682, 30472), (806, 25784), (1144, 18166), (1172, 17732), (1364, 15236), (1612, 12892), (2288, 9083), (2344, 8866), (2728, 7618), (3223, 6448), (3224, 6446), (3809, 5456), (4433, 4688)]