20705164 has 24 divisors (see below), whose sum is σ = 37368576. Its totient is φ = 10032000.

The previous prime is 20705147. The next prime is 20705171. The reversal of 20705164 is 46150702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30994 + ... + 31654.

It is an arithmetic number, because the mean of its divisors is an integer number (1557024).

Almost surely, 2^20705164 is an apocalyptic number.

It is an amenable number.

20705164 is a deficient number, since it is larger than the sum of its proper divisors (16663412).

20705164 is a wasteful number, since it uses less digits than its factorization.

20705164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20705164 is about 4550.2927378357. The cubic root of 20705164 is about 274.5951685215.

Adding to 20705164 its reverse (46150702), we get a palindrome (66855866).

The spelling of 20705164 in words is "twenty million, seven hundred five thousand, one hundred sixty-four".