20550385 has 16 divisors (see below), whose sum is σ = 26054784. Its totient is φ = 15528832.

The previous prime is 20550377. The next prime is 20550391. The reversal of 20550385 is 58305502.

It is a cyclic number.

It is not a de Polignac number, because 20550385 - 2³ = 20550377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8469 + ... + 10621.

It is an arithmetic number, because the mean of its divisors is an integer number (1628424).

Almost surely, 2^20550385 is an apocalyptic number.

It is an amenable number.

20550385 is a deficient number, since it is larger than the sum of its proper divisors (5504399).

20550385 is a wasteful number, since it uses less digits than its factorization.

20550385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 20550385 is about 4533.2532468416. The cubic root of 20550385 is about 273.9092218859.

Adding to 20550385 its reverse (58305502), we get a palindrome (78855887).

The spelling of 20550385 in words is "twenty million, five hundred fifty thousand, three hundred eighty-five".