20013544646 has 4 divisors (see below), whose sum is σ = 30020316972. Its totient is φ = 10006772322.

The previous prime is 20013544643. The next prime is 20013544657. The reversal of 20013544646 is 64644531002.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013544643) 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 as a sum of consecutive naturals, namely, 5003386160 + ... + 5003386163.

It is an arithmetic number, because the mean of its divisors is an integer number (7505079243).

Almost surely, 2^20013544646 is an apocalyptic number.

20013544646 is a deficient number, since it is larger than the sum of its proper divisors (10006772326).

20013544646 is a wasteful number, since it uses less digits than its factorization.

20013544646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006772325.

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 20013544646 in words is "twenty billion, thirteen million, five hundred forty-four thousand, six hundred forty-six".