20623040213 has 4 divisors (see below), whose sum is σ = 20699706060. Its totient is φ = 20546374368.

The previous prime is 20623040209. The next prime is 20623040219. The reversal of 20623040213 is 31204032602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10474089649 + 10148950564 = 102343^2 + 100742^2 .

It is a cyclic number.

It is not a de Polignac number, because 20623040213 - 2² = 20623040209 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 (20623040219) 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, 38332520 + ... + 38333057.

It is an arithmetic number, because the mean of its divisors is an integer number (5174926515).

Almost surely, 2^20623040213 is an apocalyptic number.

It is an amenable number.

20623040213 is a deficient number, since it is larger than the sum of its proper divisors (76665847).

20623040213 is an equidigital number, since it uses as much as digits as its factorization.

20623040213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76665846.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20623040213 its reverse (31204032602), we get a palindrome (51827072815).

The spelling of 20623040213 in words is "twenty billion, six hundred twenty-three million, forty thousand, two hundred thirteen".