20640719612 has 12 divisors (see below), whose sum is σ = 36128009736. Its totient is φ = 10318431120.

The previous prime is 20640719509. The next prime is 20640719629. The reversal of 20640719612 is 21691704602.

It is a super-2 number, since 2×20640719612² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 457958 + ... + 501005.

It is an arithmetic number, because the mean of its divisors is an integer number (3010667478).

Almost surely, 2^20640719612 is an apocalyptic number.

It is an amenable number.

20640719612 is a deficient number, since it is larger than the sum of its proper divisors (15487290124).

20640719612 is a wasteful number, since it uses less digits than its factorization.

20640719612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964348 (or 964346 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 20640719612 in words is "twenty billion, six hundred forty million, seven hundred nineteen thousand, six hundred twelve".