20774755 has 4 divisors (see below), whose sum is σ = 24929712. Its totient is φ = 16619800.

The previous prime is 20774753. The next prime is 20774783. The reversal of 20774755 is 55747702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55747702 = 2 ⋅27873851.

It is not a de Polignac number, because 20774755 - 2¹ = 20774753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20774753) 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 3 ways as a sum of consecutive naturals, for example, 2077471 + ... + 2077480.

It is an arithmetic number, because the mean of its divisors is an integer number (6232428).

Almost surely, 2^20774755 is an apocalyptic number.

20774755 is a deficient number, since it is larger than the sum of its proper divisors (4154957).

20774755 is an equidigital number, since it uses as much as digits as its factorization.

20774755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154956.

The product of its (nonzero) digits is 68600, while the sum is 37.

The square root of 20774755 is about 4557.9331938939. The cubic root of 20774755 is about 274.9024667898.

The spelling of 20774755 in words is "twenty million, seven hundred seventy-four thousand, seven hundred fifty-five".