20687023736 has 8 divisors (see below), whose sum is σ = 38788169520. Its totient is φ = 10343511864.

The previous prime is 20687023703. The next prime is 20687023823. The reversal of 20687023736 is 63732078602.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 1292938976 + ... + 1292938991.

It is an arithmetic number, because the mean of its divisors is an integer number (4848521190).

Almost surely, 2^20687023736 is an apocalyptic number.

It is an amenable number.

20687023736 is a deficient number, since it is larger than the sum of its proper divisors (18101145784).

20687023736 is a wasteful number, since it uses less digits than its factorization.

20687023736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2585877973 (or 2585877969 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 44.

The spelling of 20687023736 in words is "twenty billion, six hundred eighty-seven million, twenty-three thousand, seven hundred thirty-six".