20615623 has 24 divisors (see below), whose sum is σ = 25108272. Its totient is φ = 16861824.

The previous prime is 20615599. The next prime is 20615629. The reversal of 20615623 is 32651602.

It is not a de Polignac number, because 20615623 - 2⁵ = 20615591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20615629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 150411 + ... + 150547.

It is an arithmetic number, because the mean of its divisors is an integer number (1046178).

Almost surely, 2^20615623 is an apocalyptic number.

20615623 is a deficient number, since it is larger than the sum of its proper divisors (4492649).

20615623 is a wasteful number, since it uses less digits than its factorization.

20615623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20615623 is about 4540.4430400568. The cubic root of 20615623 is about 274.1987608925.

The spelling of 20615623 in words is "twenty million, six hundred fifteen thousand, six hundred twenty-three".