20710523 has 4 divisors (see below), whose sum is σ = 20754240. Its totient is φ = 20666808.

The previous prime is 20710517. The next prime is 20710541. The reversal of 20710523 is 32501702.

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 20710523 - 2²² = 16516219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20710495 and 20710504.

It is not an unprimeable number, because it can be changed into a prime (20700523) 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, 21140 + ... + 22097.

It is an arithmetic number, because the mean of its divisors is an integer number (5188560).

Almost surely, 2^20710523 is an apocalyptic number.

20710523 is a deficient number, since it is larger than the sum of its proper divisors (43717).

20710523 is an equidigital number, since it uses as much as digits as its factorization.

20710523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43716.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20710523 is about 4550.8815629502. The cubic root of 20710523 is about 274.6188571138.

The spelling of 20710523 in words is "twenty million, seven hundred ten thousand, five hundred twenty-three".