20243023657 has 4 divisors (see below), whose sum is σ = 20673726336. Its totient is φ = 19812320980.

The previous prime is 20243023637. The next prime is 20243023673. The reversal of 20243023657 is 75632034202.

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 20243023657 - 2²³ = 20234635049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20243023637) 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, 215351269 + ... + 215351362.

It is an arithmetic number, because the mean of its divisors is an integer number (5168431584).

Almost surely, 2^20243023657 is an apocalyptic number.

It is an amenable number.

20243023657 is a deficient number, since it is larger than the sum of its proper divisors (430702679).

20243023657 is an equidigital number, since it uses as much as digits as its factorization.

20243023657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430702678.

The product of its (nonzero) digits is 60480, while the sum is 34.

Adding to 20243023657 its reverse (75632034202), we get a palindrome (95875057859).

The spelling of 20243023657 in words is "twenty billion, two hundred forty-three million, twenty-three thousand, six hundred fifty-seven".