20040056 has 8 divisors (see below), whose sum is σ = 37575120. Its totient is φ = 10020024.

The previous prime is 20040049. The next prime is 20040067. The reversal of 20040056 is 65004002.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252496 + ... + 1252511.

It is an arithmetic number, because the mean of its divisors is an integer number (4696890).

Almost surely, 2^20040056 is an apocalyptic number.

It is an amenable number.

20040056 is a deficient number, since it is larger than the sum of its proper divisors (17535064).

20040056 is a wasteful number, since it uses less digits than its factorization.

20040056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505013 (or 2505009 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20040056 is about 4476.6121118542. The cubic root of 20040056 is about 271.6228553352.

Adding to 20040056 its reverse (65004002), we get a palindrome (85044058).

The spelling of 20040056 in words is "twenty million, forty thousand, fifty-six".