20830057 has 2 divisors, whose sum is σ = 20830058. Its totient is φ = 20830056.

The previous prime is 20830037. The next prime is 20830067. The reversal of 20830057 is 75003802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14600041 + 6230016 = 3821^2 + 2496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20830057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20830027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415028 + 10415029.

It is an arithmetic number, because the mean of its divisors is an integer number (10415029).

Almost surely, 2^20830057 is an apocalyptic number.

It is an amenable number.

20830057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20830057 is an equidigital number, since it uses as much as digits as its factorization.

20830057 is an evil number, because the sum of its binary digits is even.

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

The square root of 20830057 is about 4563.9957274301. The cubic root of 20830057 is about 275.1461790326.

Adding to 20830057 its reverse (75003802), we get a palindrome (95833859).

The spelling of 20830057 in words is "twenty million, eight hundred thirty thousand, fifty-seven".