20937516785 has 16 divisors (see below), whose sum is σ = 25755136704. Its totient is φ = 16331324352.

The previous prime is 20937516739. The next prime is 20937516793. The reversal of 20937516785 is 58761573902.

It is a cyclic number.

It is not a de Polignac number, because 20937516785 - 2³² = 16642549489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34559 + ... + 207531.

It is an arithmetic number, because the mean of its divisors is an integer number (1609696044).

Almost surely, 2^20937516785 is an apocalyptic number.

It is an amenable number.

20937516785 is a deficient number, since it is larger than the sum of its proper divisors (4817619919).

20937516785 is a wasteful number, since it uses less digits than its factorization.

20937516785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173584.

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 20937516785 in words is "twenty billion, nine hundred thirty-seven million, five hundred sixteen thousand, seven hundred eighty-five".