20112021987 has 8 divisors (see below), whose sum is σ = 28227399360. Its totient is φ = 12702329640.

The previous prime is 20112021983. The next prime is 20112022013. The reversal of 20112021987 is 78912021102.

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

It is not a de Polignac number, because 20112021987 - 2² = 20112021983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20112021983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176421189 + ... + 176421302.

It is an arithmetic number, because the mean of its divisors is an integer number (3528424920).

Almost surely, 2^20112021987 is an apocalyptic number.

20112021987 is a deficient number, since it is larger than the sum of its proper divisors (8115377373).

20112021987 is a wasteful number, since it uses less digits than its factorization.

20112021987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352842513.

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 20112021987 in words is "twenty billion, one hundred twelve million, twenty-one thousand, nine hundred eighty-seven".