20887229318 has 4 divisors (see below), whose sum is σ = 31330843980. Its totient is φ = 10443614658.

The previous prime is 20887229291. The next prime is 20887229327. The reversal of 20887229318 is 81392278802.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5221807328 + ... + 5221807331.

It is an arithmetic number, because the mean of its divisors is an integer number (7832710995).

Almost surely, 2^20887229318 is an apocalyptic number.

20887229318 is a deficient number, since it is larger than the sum of its proper divisors (10443614662).

20887229318 is a wasteful number, since it uses less digits than its factorization.

20887229318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443614661.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 20887229318 in words is "twenty billion, eight hundred eighty-seven million, two hundred twenty-nine thousand, three hundred eighteen".