20416623 has 4 divisors (see below), whose sum is σ = 27222168. Its totient is φ = 13611080.

The previous prime is 20416603. The next prime is 20416661. The reversal of 20416623 is 32661402.

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 20416623 - 2⁸ = 20416367 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20416593 and 20416602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20416603) 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, 3402768 + ... + 3402773.

It is an arithmetic number, because the mean of its divisors is an integer number (6805542).

Almost surely, 2^20416623 is an apocalyptic number.

20416623 is a deficient number, since it is larger than the sum of its proper divisors (6805545).

20416623 is an equidigital number, since it uses as much as digits as its factorization.

20416623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805544.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20416623 is about 4518.4757385649. The cubic root of 20416623 is about 273.3136381142.

The spelling of 20416623 in words is "twenty million, four hundred sixteen thousand, six hundred twenty-three".