20820887798 has 8 divisors (see below), whose sum is σ = 31440938400. Its totient is φ = 10340575000.

The previous prime is 20820887797. The next prime is 20820887803. The reversal of 20820887798 is 89778802802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820887797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34934078 + ... + 34934673.

It is an arithmetic number, because the mean of its divisors is an integer number (3930117300).

Almost surely, 2^20820887798 is an apocalyptic number.

20820887798 is a deficient number, since it is larger than the sum of its proper divisors (10620050602).

20820887798 is a wasteful number, since it uses less digits than its factorization.

20820887798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69868902.

The product of its (nonzero) digits is 7225344, while the sum is 59.

The spelling of 20820887798 in words is "twenty billion, eight hundred twenty million, eight hundred eighty-seven thousand, seven hundred ninety-eight".