20042636 has 12 divisors (see below), whose sum is σ = 35163240. Its totient is φ = 9996000.

The previous prime is 20042621. The next prime is 20042653. The reversal of 20042636 is 63624002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4490 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (2930270).

Almost surely, 2^20042636 is an apocalyptic number.

It is an amenable number.

20042636 is a deficient number, since it is larger than the sum of its proper divisors (15120604).

20042636 is a wasteful number, since it uses less digits than its factorization.

20042636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664 (or 12662 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20042636 is about 4476.9002669258. The cubic root of 20042636 is about 271.6345112723.

Adding to 20042636 its reverse (63624002), we get a palindrome (83666638).

The spelling of 20042636 in words is "twenty million, forty-two thousand, six hundred thirty-six".