20642360523 has 4 divisors (see below), whose sum is σ = 27523147368. Its totient is φ = 13761573680.

The previous prime is 20642360509. The next prime is 20642360561. The reversal of 20642360523 is 32506324602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20642360523 - 2¹⁰ = 20642359499 is a prime.

It is a super-2 number, since 2×20642360523² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20642360593) 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, 3440393418 + ... + 3440393423.

It is an arithmetic number, because the mean of its divisors is an integer number (6880786842).

Almost surely, 2^20642360523 is an apocalyptic number.

20642360523 is a deficient number, since it is larger than the sum of its proper divisors (6880786845).

20642360523 is an equidigital number, since it uses as much as digits as its factorization.

20642360523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880786844.

The product of its (nonzero) digits is 51840, while the sum is 33.

The spelling of 20642360523 in words is "twenty billion, six hundred forty-two million, three hundred sixty thousand, five hundred twenty-three".