20064021664 has 48 divisors (see below), whose sum is σ = 42639851520. Its totient is φ = 9264935680.

The previous prime is 20064021599. The next prime is 20064021689. The reversal of 20064021664 is 46612046002.

It is a super-2 number, since 2×20064021664² (a number of 21 digits) contains 22 as substring.

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, 448672 + ... + 491359.

It is an arithmetic number, because the mean of its divisors is an integer number (888330240).

Almost surely, 2^20064021664 is an apocalyptic number.

It is an amenable number.

20064021664 is an abundant number, since it is smaller than the sum of its proper divisors (22575829856).

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

20064021664 is a wasteful number, since it uses less digits than its factorization.

20064021664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940093 (or 940085 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 20064021664 its reverse (46612046002), we get a palindrome (66676067666).

The spelling of 20064021664 in words is "twenty billion, sixty-four million, twenty-one thousand, six hundred sixty-four".