20774805 has 32 divisors (see below), whose sum is σ = 35143680. Its totient is φ = 10463040.

The previous prime is 20774783. The next prime is 20774807. The reversal of 20774805 is 50847702.

It is not a de Polignac number, because 20774805 - 2⁹ = 20774293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20774807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19476 + ... + 20514.

It is an arithmetic number, because the mean of its divisors is an integer number (1098240).

Almost surely, 2^20774805 is an apocalyptic number.

It is an amenable number.

20774805 is a deficient number, since it is larger than the sum of its proper divisors (14368875).

20774805 is a wasteful number, since it uses less digits than its factorization.

20774805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20774805 is about 4557.9386788328. The cubic root of 20774805 is about 274.9026873317.

The spelling of 20774805 in words is "twenty million, seven hundred seventy-four thousand, eight hundred five".