20799785 has 8 divisors (see below), whose sum is σ = 24984456. Its totient is φ = 16623360.

The previous prime is 20799769. The next prime is 20799799. The reversal of 20799785 is 58799702.

It can be written as a sum of positive squares in 4 ways, for example, as 3193369 + 17606416 = 1787^2 + 4196^2 .

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

It is not a de Polignac number, because 20799785 - 2⁴ = 20799769 is a prime.

It is a Duffinian number.

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, 7715 + ... + 10055.

It is an arithmetic number, because the mean of its divisors is an integer number (3123057).

Almost surely, 2^20799785 is an apocalyptic number.

It is an amenable number.

20799785 is a deficient number, since it is larger than the sum of its proper divisors (4184671).

20799785 is a wasteful number, since it uses less digits than its factorization.

20799785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 20799785 is about 4560.6781294014. The cubic root of 20799785 is about 275.0128258481.

The spelling of 20799785 in words is "twenty million, seven hundred ninety-nine thousand, seven hundred eighty-five".