20008163920 has 20 divisors (see below), whose sum is σ = 46518981300. Its totient is φ = 8003265536.

The previous prime is 20008163911. The next prime is 20008163941. The reversal of 20008163920 is 2936180002.

It can be written as a sum of positive squares in 2 ways, for example, as 9865256976 + 10142906944 = 99324^2 + 100712^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125050945 + ... + 125051104.

It is an arithmetic number, because the mean of its divisors is an integer number (2325949065).

Almost surely, 2^20008163920 is an apocalyptic number.

20008163920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20008163920 is an abundant number, since it is smaller than the sum of its proper divisors (26510817380).

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

20008163920 is a wasteful number, since it uses less digits than its factorization.

20008163920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250102062 (or 250102056 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 20008163920 in words is "twenty billion, eight million, one hundred sixty-three thousand, nine hundred twenty".