64388440

素因数分解:

$2^3\times 5^1\times {\mathrm{199}}^1\times {\mathrm{8089}}^1$

素因数の和:8299

約数の個数: 32

約数和(自身を含む): 145620000

約数和(自身を除く): 81231560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 199, 398, 796, 995, 1592, 1990, 3980, 7960, 8089, 16178, 32356, 40445, 64712, 80890, 161780, 323560, 1609711, 3219422, 6438844, 8048555, 12877688, 16097110, 32194220, 64388440]

約数ペア:

[(1, 64388440), (2, 32194220), (4, 16097110), (5, 12877688), (8, 8048555), (10, 6438844), (20, 3219422), (40, 1609711), (199, 323560), (398, 161780), (796, 80890), (995, 64712), (1592, 40445), (1990, 32356), (3980, 16178), (7960, 8089)]