20775563474 has 4 divisors (see below), whose sum is σ = 31163345214. Its totient is φ = 10387781736.

The previous prime is 20775563467. The next prime is 20775563483. The reversal of 20775563474 is 47436557702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20373280225 + 402283249 = 142735^2 + 20057^2 .

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 as a sum of consecutive naturals, namely, 5193890867 + ... + 5193890870.

Almost surely, 2^20775563474 is an apocalyptic number.

20775563474 is a deficient number, since it is larger than the sum of its proper divisors (10387781740).

20775563474 is a wasteful number, since it uses less digits than its factorization.

20775563474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10387781739.

The product of its (nonzero) digits is 4939200, while the sum is 50.

The spelling of 20775563474 in words is "twenty billion, seven hundred seventy-five million, five hundred sixty-three thousand, four hundred seventy-four".