20049677818 has 4 divisors (see below), whose sum is σ = 30074516730. Its totient is φ = 10024838908.

The previous prime is 20049677803. The next prime is 20049677839. The reversal of 20049677818 is 81877694002.

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., 17359907049 + 2689770769 = 131757^2 + 51863^2 .

It is a super-2 number, since 2×20049677818² (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, 5012419453 + ... + 5012419456.

Almost surely, 2^20049677818 is an apocalyptic number.

20049677818 is a deficient number, since it is larger than the sum of its proper divisors (10024838912).

20049677818 is a wasteful number, since it uses less digits than its factorization.

20049677818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10024838911.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 20049677818 in words is "twenty billion, forty-nine million, six hundred seventy-seven thousand, eight hundred eighteen".