20785930391 has 8 divisors (see below), whose sum is σ = 20997575568. Its totient is φ = 20574400000.

The previous prime is 20785930357. The next prime is 20785930421. The reversal of 20785930391 is 19303958702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20785930391 - 2¹⁸ = 20785668247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20785930301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362231 + ... + 415671.

It is an arithmetic number, because the mean of its divisors is an integer number (2624696946).

Almost surely, 2^20785930391 is an apocalyptic number.

20785930391 is a deficient number, since it is larger than the sum of its proper divisors (211645177).

20785930391 is a wasteful number, since it uses less digits than its factorization.

20785930391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57393.

The product of its (nonzero) digits is 408240, while the sum is 47.

The spelling of 20785930391 in words is "twenty billion, seven hundred eighty-five million, nine hundred thirty thousand, three hundred ninety-one".