20164623 has 4 divisors (see below), whose sum is σ = 26886168. Its totient is φ = 13443080.

The previous prime is 20164621. The next prime is 20164631. The reversal of 20164623 is 32646102.

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 20164623 - 2¹ = 20164621 is a prime.

It is a super-2 number, since 2×20164623² = 813224041464258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20164593 and 20164602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164621) 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, 3360768 + ... + 3360773.

It is an arithmetic number, because the mean of its divisors is an integer number (6721542).

Almost surely, 2^20164623 is an apocalyptic number.

20164623 is a deficient number, since it is larger than the sum of its proper divisors (6721545).

20164623 is an equidigital number, since it uses as much as digits as its factorization.

20164623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721544.

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

The square root of 20164623 is about 4490.5036465858. The cubic root of 20164623 is about 272.1844868298.

The spelling of 20164623 in words is "twenty million, one hundred sixty-four thousand, six hundred twenty-three".