20047013 has 4 divisors (see below), whose sum is σ = 22910880. Its totient is φ = 17183148.

The previous prime is 20047009. The next prime is 20047019. The reversal of 20047013 is 31074002.

It is a happy number.

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 20047013 - 2² = 20047009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20046982 and 20047000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20047019) 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, 1431923 + ... + 1431936.

It is an arithmetic number, because the mean of its divisors is an integer number (5727720).

Almost surely, 2^20047013 is an apocalyptic number.

It is an amenable number.

20047013 is a deficient number, since it is larger than the sum of its proper divisors (2863867).

20047013 is an equidigital number, since it uses as much as digits as its factorization.

20047013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863866.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20047013 is about 4477.3890829366. The cubic root of 20047013 is about 271.6542834173.

The spelling of 20047013 in words is "twenty million, forty-seven thousand, thirteen".