20982920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{547}}^1$

素因数の和:702

約数の個数: 64

約数和(自身を含む): 54449280

約数和(自身を除く): 33466360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 137, 140, 274, 280, 547, 548, 685, 959, 1094, 1096, 1370, 1918, 2188, 2735, 2740, 3829, 3836, 4376, 4795, 5470, 5480, 7658, 7672, 9590, 10940, 15316, 19145, 19180, 21880, 30632, 38290, 38360, 74939, 76580, 149878, 153160, 299756, 374695, 524573, 599512, 749390, 1049146, 1498780, 2098292, 2622865, 2997560, 4196584, 5245730, 10491460, 20982920]

約数ペア:

[(1, 20982920), (2, 10491460), (4, 5245730), (5, 4196584), (7, 2997560), (8, 2622865), (10, 2098292), (14, 1498780), (20, 1049146), (28, 749390), (35, 599512), (40, 524573), (56, 374695), (70, 299756), (137, 153160), (140, 149878), (274, 76580), (280, 74939), (547, 38360), (548, 38290), (685, 30632), (959, 21880), (1094, 19180), (1096, 19145), (1370, 15316), (1918, 10940), (2188, 9590), (2735, 7672), (2740, 7658), (3829, 5480), (3836, 5470), (4376, 4795)]