20021764648 has 32 divisors (see below), whose sum is σ = 37667916000. Its totient is φ = 9977032000.

The previous prime is 20021764613. The next prime is 20021764667. The reversal of 20021764648 is 84646712002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20021764648.

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, 6157023 + ... + 6160273.

It is an arithmetic number, because the mean of its divisors is an integer number (1177122375).

Almost surely, 2^20021764648 is an apocalyptic number.

It is an amenable number.

20021764648 is a deficient number, since it is larger than the sum of its proper divisors (17646151352).

20021764648 is a wasteful number, since it uses less digits than its factorization.

20021764648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5625 (or 5621 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 20021764648 in words is "twenty billion, twenty-one million, seven hundred sixty-four thousand, six hundred forty-eight".