20178628986 has 16 divisors (see below), whose sum is σ = 40360752000. Its totient is φ = 6725627328.

The previous prime is 20178628979. The next prime is 20178629021. The reversal of 20178628986 is 68982687102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67266 + ... + 211853.

It is an arithmetic number, because the mean of its divisors is an integer number (2522547000).

Almost surely, 2^20178628986 is an apocalyptic number.

20178628986 is an abundant number, since it is smaller than the sum of its proper divisors (20182123014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20178628986 is a wasteful number, since it uses less digits than its factorization.

20178628986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291173.

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 20178628986 in words is "twenty billion, one hundred seventy-eight million, six hundred twenty-eight thousand, nine hundred eighty-six".