20689248964 has 24 divisors (see below), whose sum is σ = 36896790168. Its totient is φ = 10147388160.

The previous prime is 20689248961. The next prime is 20689248971. The reversal of 20689248964 is 46984298602.

It can be written as a sum of positive squares in 4 ways, for example, as 4307296900 + 16381952064 = 65630^2 + 127992^2 .

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20689248899 and 20689248908.

It is not an unprimeable number, because it can be changed into a prime (20689248961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2076234 + ... + 2086174.

It is an arithmetic number, because the mean of its divisors is an integer number (1537366257).

Almost surely, 2^20689248964 is an apocalyptic number.

It is an amenable number.

20689248964 is a deficient number, since it is larger than the sum of its proper divisors (16207541204).

20689248964 is a wasteful number, since it uses less digits than its factorization.

20689248964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19815 (or 19813 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 58.

The spelling of 20689248964 in words is "twenty billion, six hundred eighty-nine million, two hundred forty-eight thousand, nine hundred sixty-four".