20436622013 has 8 divisors (see below), whose sum is σ = 20585993400. Its totient is φ = 20287413760.

The previous prime is 20436621983. The next prime is 20436622027. The reversal of 20436622013 is 31022663402.

It can be written as a sum of positive squares in 4 ways, for example, as 1316093284 + 19120528729 = 36278^2 + 138277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20436622013 - 2⁶ = 20436621949 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 (20436622033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216581 + ... + 296277.

It is an arithmetic number, because the mean of its divisors is an integer number (2573249175).

Almost surely, 2^20436622013 is an apocalyptic number.

It is an amenable number.

20436622013 is a deficient number, since it is larger than the sum of its proper divisors (149371387).

20436622013 is a wasteful number, since it uses less digits than its factorization.

20436622013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81567.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 20436622013 in words is "twenty billion, four hundred thirty-six million, six hundred twenty-two thousand, thirteen".