20240657 has 4 divisors (see below), whose sum is σ = 20252400. Its totient is φ = 20228916.

The previous prime is 20240653. The next prime is 20240663. The reversal of 20240657 is 75604202.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20240657 - 2² = 20240653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20240651) 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 3 ways as a sum of consecutive naturals, for example, 2723 + ... + 6920.

It is an arithmetic number, because the mean of its divisors is an integer number (5063100).

Almost surely, 2^20240657 is an apocalyptic number.

It is an amenable number.

20240657 is a deficient number, since it is larger than the sum of its proper divisors (11743).

20240657 is an equidigital number, since it uses as much as digits as its factorization.

20240657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11742.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 20240657 is about 4498.9617691196. The cubic root of 20240657 is about 272.5261630745.

Adding to 20240657 its reverse (75604202), we get a palindrome (95844859).

The spelling of 20240657 in words is "twenty million, two hundred forty thousand, six hundred fifty-seven".