20423164 has 6 divisors (see below), whose sum is σ = 35740544. Its totient is φ = 10211580.

The previous prime is 20423147. The next prime is 20423177. The reversal of 20423164 is 46132402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552892 + ... + 2552899.

Almost surely, 2^20423164 is an apocalyptic number.

It is an amenable number.

20423164 is a deficient number, since it is larger than the sum of its proper divisors (15317380).

20423164 is a wasteful number, since it uses less digits than its factorization.

20423164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5105795 (or 5105793 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20423164 is about 4519.1994866348. The cubic root of 20423164 is about 273.3428227256.

Adding to 20423164 its reverse (46132402), we get a palindrome (66555566).

The spelling of 20423164 in words is "twenty million, four hundred twenty-three thousand, one hundred sixty-four".