20777685 has 8 divisors (see below), whose sum is σ = 33244320. Its totient is φ = 11081424.

The previous prime is 20777681. The next prime is 20777699. The reversal of 20777685 is 58677702.

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

It is not a de Polignac number, because 20777685 - 2² = 20777681 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20777681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692575 + ... + 692604.

It is an arithmetic number, because the mean of its divisors is an integer number (4155540).

Almost surely, 2^20777685 is an apocalyptic number.

It is an amenable number.

20777685 is a deficient number, since it is larger than the sum of its proper divisors (12466635).

20777685 is a wasteful number, since it uses less digits than its factorization.

20777685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385187.

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 20777685 is about 4558.2546001732. The cubic root of 20777685 is about 274.9153899484.

The spelling of 20777685 in words is "twenty million, seven hundred seventy-seven thousand, six hundred eighty-five".