20774761 has 4 divisors (see below), whose sum is σ = 23742592. Its totient is φ = 17806932.

The previous prime is 20774753. The next prime is 20774783. The reversal of 20774761 is 16747702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20774761 - 2³ = 20774753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20774161) 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, 1483905 + ... + 1483918.

It is an arithmetic number, because the mean of its divisors is an integer number (5935648).

Almost surely, 2^20774761 is an apocalyptic number.

It is an amenable number.

20774761 is a deficient number, since it is larger than the sum of its proper divisors (2967831).

20774761 is an equidigital number, since it uses as much as digits as its factorization.

20774761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967830.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 20774761 is about 4557.9338520869. The cubic root of 20774761 is about 274.9024932548.

The spelling of 20774761 in words is "twenty million, seven hundred seventy-four thousand, seven hundred sixty-one".