20040013 has 4 divisors (see below), whose sum is σ = 22902880. Its totient is φ = 17177148.

The previous prime is 20039993. The next prime is 20040049. The reversal of 20040013 is 31004002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20040013 - 2⁹ = 20039501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040313) 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, 1431423 + ... + 1431436.

It is an arithmetic number, because the mean of its divisors is an integer number (5725720).

Almost surely, 2^20040013 is an apocalyptic number.

It is an amenable number.

20040013 is a deficient number, since it is larger than the sum of its proper divisors (2862867).

20040013 is an equidigital number, since it uses as much as digits as its factorization.

20040013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862866.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20040013 is about 4476.6073091126. The cubic root of 20040013 is about 271.6226610611.

Adding to 20040013 its reverse (31004002), we get a palindrome (51044015).

The spelling of 20040013 in words is "twenty million, forty thousand, thirteen".