20774911 has 4 divisors (see below), whose sum is σ = 21678192. Its totient is φ = 19871632.

The previous prime is 20774909. The next prime is 20774917. The reversal of 20774911 is 11947702.

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

It is not a de Polignac number, because 20774911 - 2¹ = 20774909 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451606 + ... + 451651.

It is an arithmetic number, because the mean of its divisors is an integer number (5419548).

Almost surely, 2^20774911 is an apocalyptic number.

20774911 is a deficient number, since it is larger than the sum of its proper divisors (903281).

20774911 is an equidigital number, since it uses as much as digits as its factorization.

20774911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903280.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 20774911 is about 4557.9503068814. The cubic root of 20774911 is about 274.9031548793.

The spelling of 20774911 in words is "twenty million, seven hundred seventy-four thousand, nine hundred eleven".