20030857 has 16 divisors (see below), whose sum is σ = 25488000. Its totient is φ = 15605520.

The previous prime is 20030849. The next prime is 20030893. The reversal of 20030857 is 75803002.

It is not a de Polignac number, because 20030857 - 2³ = 20030849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20030057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1119 + ... + 6427.

It is an arithmetic number, because the mean of its divisors is an integer number (1593000).

Almost surely, 2^20030857 is an apocalyptic number.

It is an amenable number.

20030857 is a deficient number, since it is larger than the sum of its proper divisors (5457143).

20030857 is an equidigital number, since it uses as much as digits as its factorization.

20030857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341 (or 5327 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20030857 is about 4475.5845428279. The cubic root of 20030857 is about 271.5812879020.

Adding to 20030857 its reverse (75803002), we get a palindrome (95833859).

The spelling of 20030857 in words is "twenty million, thirty thousand, eight hundred fifty-seven".