20397523 has 8 divisors (see below), whose sum is σ = 20934848. Its totient is φ = 19863144.

The previous prime is 20397511. The next prime is 20397529. The reversal of 20397523 is 32579302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20397523 - 2¹⁷ = 20266451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20397529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22036 + ... + 22942.

It is an arithmetic number, because the mean of its divisors is an integer number (2616856).

Almost surely, 2^20397523 is an apocalyptic number.

20397523 is a deficient number, since it is larger than the sum of its proper divisors (537325).

20397523 is an equidigital number, since it uses as much as digits as its factorization.

20397523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473.

The product of its (nonzero) digits is 11340, while the sum is 31.

The square root of 20397523 is about 4516.3616994213. The cubic root of 20397523 is about 273.2283821079.

The spelling of 20397523 in words is "twenty million, three hundred ninety-seven thousand, five hundred twenty-three".