20523389 has 8 divisors (see below), whose sum is σ = 20932440. Its totient is φ = 20116800.

The previous prime is 20523379. The next prime is 20523407. The reversal of 20523389 is 98332502.

It can be written as a sum of positive squares in 4 ways, for example, as 3367225 + 17156164 = 1835^2 + 4142^2 .

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 20523389 - 2¹² = 20519293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523379) 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, 30719 + ... + 31379.

It is an arithmetic number, because the mean of its divisors is an integer number (2616555).

Almost surely, 2^20523389 is an apocalyptic number.

It is an amenable number.

20523389 is a deficient number, since it is larger than the sum of its proper divisors (409051).

20523389 is an equidigital number, since it uses as much as digits as its factorization.

20523389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 20523389 is about 4530.2747157319. The cubic root of 20523389 is about 273.7892291035.

The spelling of 20523389 in words is "twenty million, five hundred twenty-three thousand, three hundred eighty-nine".