20500064 has 24 divisors (see below), whose sum is σ = 43464960. Its totient is φ = 9461376.

The previous prime is 20500063. The next prime is 20500091. The reversal of 20500064 is 46000502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24224 + ... + 25055.

It is an arithmetic number, because the mean of its divisors is an integer number (1811040).

Almost surely, 2^20500064 is an apocalyptic number.

It is an amenable number.

20500064 is an abundant number, since it is smaller than the sum of its proper divisors (22964896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20500064 is a wasteful number, since it uses less digits than its factorization.

20500064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49302 (or 49294 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20500064 is about 4527.6996366809. The cubic root of 20500064 is about 273.6854685502.

Adding to 20500064 its reverse (46000502), we get a palindrome (66500566).

The spelling of 20500064 in words is "twenty million, five hundred thousand, sixty-four".