20499799442 has 4 divisors (see below), whose sum is σ = 30749699166. Its totient is φ = 10249899720.

The previous prime is 20499799379. The next prime is 20499799451. The reversal of 20499799442 is 24499799402.

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

It can be written as a sum of positive squares in only one way, i.e., 16062774121 + 4437025321 = 126739^2 + 66611^2 .

It is a super-2 number, since 2×20499799442² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5124949859 + ... + 5124949862.

Almost surely, 2^20499799442 is an apocalyptic number.

20499799442 is a deficient number, since it is larger than the sum of its proper divisors (10249899724).

20499799442 is a wasteful number, since it uses less digits than its factorization.

20499799442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10249899723.

The product of its (nonzero) digits is 11757312, while the sum is 59.

The spelling of 20499799442 in words is "twenty billion, four hundred ninety-nine million, seven hundred ninety-nine thousand, four hundred forty-two".