20016979890 has 16 divisors (see below), whose sum is σ = 48040751808. Its totient is φ = 5337861296.

The previous prime is 20016979889. The next prime is 20016979897. The reversal of 20016979890 is 9897961002.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20016979897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333616302 + ... + 333616361.

It is an arithmetic number, because the mean of its divisors is an integer number (3002546988).

Almost surely, 2^20016979890 is an apocalyptic number.

20016979890 is an abundant number, since it is smaller than the sum of its proper divisors (28023771918).

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

20016979890 is a wasteful number, since it uses less digits than its factorization.

20016979890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667232673.

The product of its (nonzero) digits is 489888, while the sum is 51.

The spelling of 20016979890 in words is "twenty billion, sixteen million, nine hundred seventy-nine thousand, eight hundred ninety".