20427777 has 12 divisors (see below), whose sum is σ = 29545984. Its totient is φ = 13600440.

The previous prime is 20427773. The next prime is 20427787. The reversal of 20427777 is 77772402.

It is not a de Polignac number, because 20427777 - 2² = 20427773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20427773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12468 + ... + 14010.

Almost surely, 2^20427777 is an apocalyptic number.

It is an amenable number.

20427777 is a deficient number, since it is larger than the sum of its proper divisors (9118207).

20427777 is a wasteful number, since it uses less digits than its factorization.

20427777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020 (or 3017 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 20427777 is about 4519.7098358191. The cubic root of 20427777 is about 273.3634012464.

The spelling of 20427777 in words is "twenty million, four hundred twenty-seven thousand, seven hundred seventy-seven".