20774745 has 16 divisors (see below), whose sum is σ = 36933120. Its totient is φ = 11079792.

The previous prime is 20774707. The next prime is 20774753. The reversal of 20774745 is 54747702.

It is a happy number.

It is not a de Polignac number, because 20774745 - 2⁹ = 20774233 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 76809 + ... + 77078.

It is an arithmetic number, because the mean of its divisors is an integer number (2308320).

Almost surely, 2^20774745 is an apocalyptic number.

It is an amenable number.

20774745 is a deficient number, since it is larger than the sum of its proper divisors (16158375).

20774745 is a wasteful number, since it uses less digits than its factorization.

20774745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153901 (or 153895 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

The square root of 20774745 is about 4557.9320969053. The cubic root of 20774745 is about 274.9024226813.

The spelling of 20774745 in words is "twenty million, seven hundred seventy-four thousand, seven hundred forty-five".