20382857 has 4 divisors (see below), whose sum is σ = 22235856. Its totient is φ = 18529860.

The previous prime is 20382833. The next prime is 20382889. The reversal of 20382857 is 75828302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20382857 - 2¹⁸ = 20120713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20882857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 926483 + ... + 926504.

It is an arithmetic number, because the mean of its divisors is an integer number (5558964).

Almost surely, 2^20382857 is an apocalyptic number.

It is an amenable number.

20382857 is a deficient number, since it is larger than the sum of its proper divisors (1852999).

20382857 is a wasteful number, since it uses less digits than its factorization.

20382857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852998.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 20382857 is about 4514.7377553962. The cubic root of 20382857 is about 273.1628818634.

The spelling of 20382857 in words is "twenty million, three hundred eighty-two thousand, eight hundred fifty-seven".