20465567 has 4 divisors (see below), whose sum is σ = 20484216. Its totient is φ = 20446920.

The previous prime is 20465563. The next prime is 20465587. The reversal of 20465567 is 76556402.

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 20465567 - 2² = 20465563 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 (20465563) 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, 7568 + ... + 9909.

It is an arithmetic number, because the mean of its divisors is an integer number (5121054).

Almost surely, 2^20465567 is an apocalyptic number.

20465567 is a deficient number, since it is larger than the sum of its proper divisors (18649).

20465567 is a wasteful number, since it uses less digits than its factorization.

20465567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18648.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 20465567 is about 4523.8884822683. Note that the first 3 decimals coincide. The cubic root of 20465567 is about 273.5318653153.

The spelling of 20465567 in words is "twenty million, four hundred sixty-five thousand, five hundred sixty-seven".