21047920

素因数分解:

$2^4\times 5^1\times {\mathrm{307}}^1\times {\mathrm{857}}^1$

素因数の和:1177

約数の個数: 40

約数和(自身を含む): 49153104

約数和(自身を除く): 28105184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 307, 614, 857, 1228, 1535, 1714, 2456, 3070, 3428, 4285, 4912, 6140, 6856, 8570, 12280, 13712, 17140, 24560, 34280, 68560, 263099, 526198, 1052396, 1315495, 2104792, 2630990, 4209584, 5261980, 10523960, 21047920]

約数ペア:

[(1, 21047920), (2, 10523960), (4, 5261980), (5, 4209584), (8, 2630990), (10, 2104792), (16, 1315495), (20, 1052396), (40, 526198), (80, 263099), (307, 68560), (614, 34280), (857, 24560), (1228, 17140), (1535, 13712), (1714, 12280), (2456, 8570), (3070, 6856), (3428, 6140), (4285, 4912)]