20385964672 has 16 divisors (see below), whose sum is σ = 40612664250. Its totient is φ = 10192982272.

The previous prime is 20385964631. The next prime is 20385964741. The reversal of 20385964672 is 27646958302.

It can be written as a sum of positive squares in only one way, i.e., 13081869376 + 7304095296 = 114376^2 + 85464^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79632547 + ... + 79632802.

Almost surely, 2^20385964672 is an apocalyptic number.

It is an amenable number.

20385964672 is a deficient number, since it is larger than the sum of its proper divisors (20226699578).

20385964672 is an equidigital number, since it uses as much as digits as its factorization.

20385964672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159265363 (or 159265351 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 20385964672 in words is "twenty billion, three hundred eighty-five million, nine hundred sixty-four thousand, six hundred seventy-two".