20013011 has 4 divisors (see below), whose sum is σ = 20658624. Its totient is φ = 19367400.

The previous prime is 20012999. The next prime is 20013031. The reversal of 20013011 is 11031002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11031002 = 2 ⋅5515501.

It is a cyclic number.

It is not a de Polignac number, because 20013011 - 2¹⁰ = 20011987 is a prime.

It is a super-2 number, since 2×20013011² = 801041218572242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20013011.

It is not an unprimeable number, because it can be changed into a prime (20013031) 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, 322760 + ... + 322821.

It is an arithmetic number, because the mean of its divisors is an integer number (5164656).

Almost surely, 2^20013011 is an apocalyptic number.

20013011 is a deficient number, since it is larger than the sum of its proper divisors (645613).

20013011 is an equidigital number, since it uses as much as digits as its factorization.

20013011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645612.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 20013011 is about 4473.5903925147. The cubic root of 20013011 is about 271.5006110459.

Adding to 20013011 its reverse (11031002), we get a palindrome (31044013).

Subtracting from 20013011 its reverse (11031002), we obtain a square (8982009 = 2997²).

The spelling of 20013011 in words is "twenty million, thirteen thousand, eleven".