20045013 has 4 divisors (see below), whose sum is σ = 26726688. Its totient is φ = 13363340.

The previous prime is 20044987. The next prime is 20045017. The reversal of 20045013 is 31054002.

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 20045013 - 2⁶ = 20044949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20044983 and 20045001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045017) 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, 3340833 + ... + 3340838.

It is an arithmetic number, because the mean of its divisors is an integer number (6681672).

Almost surely, 2^20045013 is an apocalyptic number.

It is an amenable number.

20045013 is a deficient number, since it is larger than the sum of its proper divisors (6681675).

20045013 is an equidigital number, since it uses as much as digits as its factorization.

20045013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6681674.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20045013 is about 4477.1657329163. The cubic root of 20045013 is about 271.6452492096.

Adding to 20045013 its reverse (31054002), we get a palindrome (51099015).

The spelling of 20045013 in words is "twenty million, forty-five thousand, thirteen".