20552857 has 8 divisors (see below), whose sum is σ = 22268736. Its totient is φ = 18856272.

The previous prime is 20552843. The next prime is 20552879. The reversal of 20552857 is 75825502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20552857 - 2¹¹ = 20550809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20552837) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2563 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (2783592).

Almost surely, 2^20552857 is an apocalyptic number.

It is an amenable number.

20552857 is a deficient number, since it is larger than the sum of its proper divisors (1715879).

20552857 is a wasteful number, since it uses less digits than its factorization.

20552857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9647.

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 20552857 is about 4533.5258905183. The cubic root of 20552857 is about 273.9202042665.

The spelling of 20552857 in words is "twenty million, five hundred fifty-two thousand, eight hundred fifty-seven".