20213013 has 4 divisors (see below), whose sum is σ = 26950688. Its totient is φ = 13475340.

The previous prime is 20212991. The next prime is 20213047. The reversal of 20213013 is 31031202.

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 not a de Polignac number, because 20213013 - 2²⁰ = 19164437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20213013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212013) 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, 3368833 + ... + 3368838.

It is an arithmetic number, because the mean of its divisors is an integer number (6737672).

Almost surely, 2^20213013 is an apocalyptic number.

It is an amenable number.

20213013 is a deficient number, since it is larger than the sum of its proper divisors (6737675).

20213013 is an equidigital number, since it uses as much as digits as its factorization.

20213013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737674.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20213013 is about 4495.8884550220. Note that the first 3 decimals coincide. The cubic root of 20213013 is about 272.4020375645.

Adding to 20213013 its reverse (31031202), we get a palindrome (51244215).

It can be divided in two parts, 2021301 and 3, that multiplied together give a triangular number (6063903 = T₃₄₈₂).

The spelling of 20213013 in words is "twenty million, two hundred thirteen thousand, thirteen".