20177869785 has 8 divisors (see below), whose sum is σ = 32284591680. Its totient is φ = 10761530544.

The previous prime is 20177869763. The next prime is 20177869819. The reversal of 20177869785 is 58796877102.

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

It is not a de Polignac number, because 20177869785 - 2⁵ = 20177869753 is a prime.

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, 672595645 + ... + 672595674.

It is an arithmetic number, because the mean of its divisors is an integer number (4035573960).

Almost surely, 2^20177869785 is an apocalyptic number.

It is an amenable number.

20177869785 is a deficient number, since it is larger than the sum of its proper divisors (12106721895).

20177869785 is a wasteful number, since it uses less digits than its factorization.

20177869785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345191327.

The product of its (nonzero) digits is 11854080, while the sum is 60.

The spelling of 20177869785 in words is "twenty billion, one hundred seventy-seven million, eight hundred sixty-nine thousand, seven hundred eighty-five".