20477161 has 4 divisors (see below), whose sum is σ = 21183300. Its totient is φ = 19771024.

The previous prime is 20477147. The next prime is 20477167. The reversal of 20477161 is 16177402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3920400 + 16556761 = 1980^2 + 4069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20477161 - 2⁹ = 20476649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20477167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353026 + ... + 353083.

It is an arithmetic number, because the mean of its divisors is an integer number (5295825).

Almost surely, 2^20477161 is an apocalyptic number.

It is an amenable number.

20477161 is a deficient number, since it is larger than the sum of its proper divisors (706139).

20477161 is an equidigital number, since it uses as much as digits as its factorization.

20477161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706138.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20477161 is about 4525.1697205740. The cubic root of 20477161 is about 273.5835086400.

The spelling of 20477161 in words is "twenty million, four hundred seventy-seven thousand, one hundred sixty-one".