20540523 has 4 divisors (see below), whose sum is σ = 27387368. Its totient is φ = 13693680.

The previous prime is 20540519. The next prime is 20540537. The reversal of 20540523 is 32504502.

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

It is not a de Polignac number, because 20540523 - 2² = 20540519 is a prime.

It is a super-2 number, since 2×20540523² = 843826170227058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20540523.

It is not an unprimeable number, because it can be changed into a prime (20540503) 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, 3423418 + ... + 3423423.

It is an arithmetic number, because the mean of its divisors is an integer number (6846842).

Almost surely, 2^20540523 is an apocalyptic number.

20540523 is a deficient number, since it is larger than the sum of its proper divisors (6846845).

20540523 is an equidigital number, since it uses as much as digits as its factorization.

20540523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6846844.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20540523 is about 4532.1653765060. The cubic root of 20540523 is about 273.8653991064.

The spelling of 20540523 in words is "twenty million, five hundred forty thousand, five hundred twenty-three".