20899623 has 8 divisors (see below), whose sum is σ = 28067200. Its totient is φ = 13832568.

The previous prime is 20899607. The next prime is 20899679. The reversal of 20899623 is 32699802.

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

It is not a de Polignac number, because 20899623 - 2⁴ = 20899607 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 (20899693) 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, 24643 + ... + 25476.

It is an arithmetic number, because the mean of its divisors is an integer number (3508400).

Almost surely, 2^20899623 is an apocalyptic number.

20899623 is a deficient number, since it is larger than the sum of its proper divisors (7167577).

20899623 is a wasteful number, since it uses less digits than its factorization.

20899623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50261.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20899623 is about 4571.6105477173. The cubic root of 20899623 is about 275.4521399554.

The spelling of 20899623 in words is "twenty million, eight hundred ninety-nine thousand, six hundred twenty-three".