20477764 has 12 divisors (see below), whose sum is σ = 35877100. Its totient is φ = 10227168.

The previous prime is 20477753. The next prime is 20477777. The reversal of 20477764 is 46777402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4875264 + 15602500 = 2208^2 + 3950^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1882 + ... + 6670.

Almost surely, 2^20477764 is an apocalyptic number.

It is an amenable number.

20477764 is a deficient number, since it is larger than the sum of its proper divisors (15399336).

20477764 is a wasteful number, since it uses less digits than its factorization.

20477764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862 (or 5860 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 37.

The square root of 20477764 is about 4525.2363474188. The cubic root of 20477764 is about 273.5861940584.

The spelling of 20477764 in words is "twenty million, four hundred seventy-seven thousand, seven hundred sixty-four".