20523669 has 4 divisors (see below), whose sum is σ = 27364896. Its totient is φ = 13682444.

The previous prime is 20523653. The next prime is 20523673. The reversal of 20523669 is 96632502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20523669 - 2⁴ = 20523653 is a prime.

It is a super-2 number, since 2×20523669² = 842441978443122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523649) 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, 3420609 + ... + 3420614.

It is an arithmetic number, because the mean of its divisors is an integer number (6841224).

Almost surely, 2^20523669 is an apocalyptic number.

It is an amenable number.

20523669 is a deficient number, since it is larger than the sum of its proper divisors (6841227).

20523669 is an equidigital number, since it uses as much as digits as its factorization.

20523669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6841226.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 20523669 is about 4530.3056188297. The cubic root of 20523669 is about 273.7904741974.

The spelling of 20523669 in words is "twenty million, five hundred twenty-three thousand, six hundred sixty-nine".