20352857 has 16 divisors (see below), whose sum is σ = 24685440. Its totient is φ = 16391808.

The previous prime is 20352853. The next prime is 20352863. The reversal of 20352857 is 75825302.

It is a cyclic number.

It is not a de Polignac number, because 20352857 - 2² = 20352853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20352853) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17663 + ... + 18779.

It is an arithmetic number, because the mean of its divisors is an integer number (1542840).

Almost surely, 2^20352857 is an apocalyptic number.

It is an amenable number.

20352857 is a deficient number, since it is larger than the sum of its proper divisors (4332583).

20352857 is a wasteful number, since it uses less digits than its factorization.

20352857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20352857 is about 4511.4140798645. The cubic root of 20352857 is about 273.0288000674.

The spelling of 20352857 in words is "twenty million, three hundred fifty-two thousand, eight hundred fifty-seven".