20785211 has 4 divisors (see below), whose sum is σ = 21268632. Its totient is φ = 20301792.

The previous prime is 20785207. The next prime is 20785213. The reversal of 20785211 is 11258702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20785211 - 2² = 20785207 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (20785213) 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 3 ways as a sum of consecutive naturals, for example, 241646 + ... + 241731.

It is an arithmetic number, because the mean of its divisors is an integer number (5317158).

Almost surely, 2^20785211 is an apocalyptic number.

20785211 is a deficient number, since it is larger than the sum of its proper divisors (483421).

20785211 is an equidigital number, since it uses as much as digits as its factorization.

20785211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483420.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20785211 is about 4559.0800607140. The cubic root of 20785211 is about 274.9485788153.

The spelling of 20785211 in words is "twenty million, seven hundred eighty-five thousand, two hundred eleven".