20988528878 has 8 divisors (see below), whose sum is σ = 31573522872. Its totient is φ = 10464021256.

The previous prime is 20988528857. The next prime is 20988528901. The reversal of 20988528878 is 87882588902.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15120725 + ... + 15122112.

It is an arithmetic number, because the mean of its divisors is an integer number (3946690359).

Almost surely, 2^20988528878 is an apocalyptic number.

20988528878 is a deficient number, since it is larger than the sum of its proper divisors (10584993994).

20988528878 is a wasteful number, since it uses less digits than its factorization.

20988528878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30243186.

The product of its (nonzero) digits is 41287680, while the sum is 65.

The spelling of 20988528878 in words is "twenty billion, nine hundred eighty-eight million, five hundred twenty-eight thousand, eight hundred seventy-eight".