20670777 has 12 divisors (see below), whose sum is σ = 30050020. Its totient is φ = 13691808.

The previous prime is 20670763. The next prime is 20670817. The reversal of 20670777 is 77707602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4822416 + 15848361 = 2196^2 + 3981^2 .

It is not a de Polignac number, because 20670777 - 2²⁰ = 19622201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20670737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5902 + ... + 8727.

Almost surely, 2^20670777 is an apocalyptic number.

It is an amenable number.

20670777 is a deficient number, since it is larger than the sum of its proper divisors (9379243).

20670777 is a wasteful number, since it uses less digits than its factorization.

20670777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14792 (or 14789 counting only the distinct ones).

The product of its (nonzero) digits is 28812, while the sum is 36.

The square root of 20670777 is about 4546.5126195800. The cubic root of 20670777 is about 274.4430690060.

The spelling of 20670777 in words is "twenty million, six hundred seventy thousand, seven hundred seventy-seven".