20013013 has 4 divisors (see below), whose sum is σ = 20883168. Its totient is φ = 19142860.

The previous prime is 20012999. The next prime is 20013031. The reversal of 20013013 is 31031002.

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 20013013 - 2⁵ = 20012981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013053) 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, 435043 + ... + 435088.

It is an arithmetic number, because the mean of its divisors is an integer number (5220792).

Almost surely, 2^20013013 is an apocalyptic number.

20013013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20013013 is a deficient number, since it is larger than the sum of its proper divisors (870155).

20013013 is an equidigital number, since it uses as much as digits as its factorization.

20013013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870154.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20013013 is about 4473.5906160488. The cubic root of 20013013 is about 271.5006200900.

Adding to 20013013 its reverse (31031002), we get a palindrome (51044015).

The spelling of 20013013 in words is "twenty million, thirteen thousand, thirteen".