20605057 has 8 divisors (see below), whose sum is σ = 22593600. Its totient is φ = 18635760.

The previous prime is 20605043. The next prime is 20605069. The reversal of 20605057 is 75050602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20605057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20605157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2518 + ... + 6895.

It is an arithmetic number, because the mean of its divisors is an integer number (2824200).

Almost surely, 2^20605057 is an apocalyptic number.

It is an amenable number.

20605057 is a deficient number, since it is larger than the sum of its proper divisors (1988543).

20605057 is a wasteful number, since it uses less digits than its factorization.

20605057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9623.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20605057 is about 4539.2793480904. The cubic root of 20605057 is about 274.1519084123.

Adding to 20605057 its reverse (75050602), we get a palindrome (95655659).

It can be divided in two parts, 2060 and 5057, that added together give a palindrome (7117).

The spelling of 20605057 in words is "twenty million, six hundred five thousand, fifty-seven".