20650064 has 10 divisors (see below), whose sum is σ = 40009530. Its totient is φ = 10325024.

The previous prime is 20650057. The next prime is 20650081. The reversal of 20650064 is 46005602.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 6210064 = 3800^2 + 2492^2 .

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, 645299 + ... + 645330.

It is an arithmetic number, because the mean of its divisors is an integer number (4000953).

Almost surely, 2^20650064 is an apocalyptic number.

It is an amenable number.

20650064 is a deficient number, since it is larger than the sum of its proper divisors (19359466).

20650064 is a wasteful number, since it uses less digits than its factorization.

20650064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290637 (or 1290631 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20650064 is about 4544.2341488968. The cubic root of 20650064 is about 274.3513704846.

Adding to 20650064 its reverse (46005602), we get a palindrome (66655666).

The spelling of 20650064 in words is "twenty million, six hundred fifty thousand, sixty-four".