20633898994 has 4 divisors (see below), whose sum is σ = 30950848494. Its totient is φ = 10316949496.

The previous prime is 20633898973. The next prime is 20633899003. The reversal of 20633898994 is 49989833602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49989833602 = 2 ⋅24994916801.

It can be written as a sum of positive squares in only one way, i.e., 15590768769 + 5043130225 = 124863^2 + 71015^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5158474747 + ... + 5158474750.

Almost surely, 2^20633898994 is an apocalyptic number.

20633898994 is a deficient number, since it is larger than the sum of its proper divisors (10316949500).

20633898994 is a wasteful number, since it uses less digits than its factorization.

20633898994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10316949499.

The product of its (nonzero) digits is 20155392, while the sum is 61.

The spelling of 20633898994 in words is "twenty billion, six hundred thirty-three million, eight hundred ninety-eight thousand, nine hundred ninety-four".