20138007820 has 24 divisors (see below), whose sum is σ = 48331219104. Its totient is φ = 6904459776.

The previous prime is 20138007767. The next prime is 20138007859. The reversal of 20138007820 is 2870083102.

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, 71921317 + ... + 71921596.

It is an arithmetic number, because the mean of its divisors is an integer number (2013800796).

Almost surely, 2^20138007820 is an apocalyptic number.

20138007820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20138007820 is an abundant number, since it is smaller than the sum of its proper divisors (28193211284).

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

20138007820 is a wasteful number, since it uses less digits than its factorization.

20138007820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143842929 (or 143842927 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 20138007820 in words is "twenty billion, one hundred thirty-eight million, seven thousand, eight hundred twenty".