20774505 has 16 divisors (see below), whose sum is σ = 34989120. Its totient is φ = 10496448.

The previous prime is 20774503. The next prime is 20774519. The reversal of 20774505 is 50547702.

It is not a de Polignac number, because 20774505 - 2¹ = 20774503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20774503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36162 + ... + 36731.

It is an arithmetic number, because the mean of its divisors is an integer number (2186820).

Almost surely, 2^20774505 is an apocalyptic number.

It is an amenable number.

20774505 is a deficient number, since it is larger than the sum of its proper divisors (14214615).

20774505 is a wasteful number, since it uses less digits than its factorization.

20774505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72920.

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20774505 is about 4557.9057691005. The cubic root of 20774505 is about 274.9013640749.

The spelling of 20774505 in words is "twenty million, seven hundred seventy-four thousand, five hundred five".