20003635213 has 4 divisors (see below), whose sum is σ = 20005580700. Its totient is φ = 20001689728.

The previous prime is 20003635189. The next prime is 20003635229. The reversal of 20003635213 is 31253630002.

It is a happy number.

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 5721712164 + 14281923049 = 75642^2 + 119507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20003635213 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 (20003635243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 957238 + ... + 977911.

It is an arithmetic number, because the mean of its divisors is an integer number (5001395175).

Almost surely, 2^20003635213 is an apocalyptic number.

It is an amenable number.

20003635213 is a deficient number, since it is larger than the sum of its proper divisors (1945487).

20003635213 is a wasteful number, since it uses less digits than its factorization.

20003635213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945486.

The product of its (nonzero) digits is 3240, while the sum is 25.

The spelling of 20003635213 in words is "twenty billion, three million, six hundred thirty-five thousand, two hundred thirteen".