20002042644 has 36 divisors (see below), whose sum is σ = 48706346976. Its totient is φ = 6376713728.

The previous prime is 20002042633. The next prime is 20002042649. The reversal of 20002042644 is 44624020002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002042649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2345332 + ... + 2353844.

Almost surely, 2^20002042644 is an apocalyptic number.

It is an amenable number.

20002042644 is an abundant number, since it is smaller than the sum of its proper divisors (28704304332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20002042644 is an frugal number, since it uses more digits than its factorization.

20002042644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17056 (or 8541 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20002042644 its reverse (44624020002), we get a palindrome (64626062646).

The spelling of 20002042644 in words is "twenty billion, two million, forty-two thousand, six hundred forty-four".