20081477 has 4 divisors (see below), whose sum is σ = 21626220. Its totient is φ = 18536736.

The previous prime is 20081449. The next prime is 20081483. The reversal of 20081477 is 77418002.

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 2825761 + 17255716 = 1681^2 + 4154^2 .

It is a cyclic number.

It is not a de Polignac number, because 20081477 - 2⁸ = 20081221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20081447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772352 + ... + 772377.

It is an arithmetic number, because the mean of its divisors is an integer number (5406555).

Almost surely, 2^20081477 is an apocalyptic number.

It is an amenable number.

20081477 is a deficient number, since it is larger than the sum of its proper divisors (1544743).

20081477 is a wasteful number, since it uses less digits than its factorization.

20081477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544742.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 20081477 is about 4481.2361017916. The cubic root of 20081477 is about 271.8098665833.

Adding to 20081477 its reverse (77418002), we get a palindrome (97499479).

The spelling of 20081477 in words is "twenty million, eighty-one thousand, four hundred seventy-seven".