20145489876 has 18 divisors (see below), whose sum is σ = 50923321722. Its totient is φ = 6715163280.

The previous prime is 20145489839. The next prime is 20145489953. The reversal of 20145489876 is 67898454102.

It is a happy number.

20145489876 is a `hidden beast` number, since 2 + 0 + 1 + 4 + 548 + 98 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13906069776 + 6239420100 = 117924^2 + 78990^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279798435 + ... + 279798506.

It is an arithmetic number, because the mean of its divisors is an integer number (2829073429).

Almost surely, 2^20145489876 is an apocalyptic number.

It is an amenable number.

20145489876 is an abundant number, since it is smaller than the sum of its proper divisors (30777831846).

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

20145489876 is a wasteful number, since it uses less digits than its factorization.

20145489876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559596951 (or 559596946 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 20145489876 in words is "twenty billion, one hundred forty-five million, four hundred eighty-nine thousand, eight hundred seventy-six".