20535857 has 16 divisors (see below), whose sum is σ = 22394880. Its totient is φ = 18782400.

The previous prime is 20535841. The next prime is 20535859. The reversal of 20535857 is 75853502.

It is a cyclic number.

It is not a de Polignac number, because 20535857 - 2⁴ = 20535841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20535859) 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, 47432 + ... + 47862.

It is an arithmetic number, because the mean of its divisors is an integer number (1399680).

Almost surely, 2^20535857 is an apocalyptic number.

It is an amenable number.

20535857 is a deficient number, since it is larger than the sum of its proper divisors (1859023).

20535857 is a wasteful number, since it uses less digits than its factorization.

20535857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 20535857 is about 4531.6505822934. The cubic root of 20535857 is about 273.8446603822.

The spelling of 20535857 in words is "twenty million, five hundred thirty-five thousand, eight hundred fifty-seven".