20647142968 has 32 divisors (see below), whose sum is σ = 39148804800. Its totient is φ = 10207660032.

The previous prime is 20647142917. The next prime is 20647142981. The reversal of 20647142968 is 86924174602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864321 + ... + 887887.

It is an arithmetic number, because the mean of its divisors is an integer number (1223400150).

Almost surely, 2^20647142968 is an apocalyptic number.

It is an amenable number.

20647142968 is a deficient number, since it is larger than the sum of its proper divisors (18501661832).

20647142968 is a wasteful number, since it uses less digits than its factorization.

20647142968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24799 (or 24795 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 20647142968 in words is "twenty billion, six hundred forty-seven million, one hundred forty-two thousand, nine hundred sixty-eight".