20133375138 has 48 divisors (see below), whose sum is σ = 44930920320. Its totient is φ = 6510850848.

The previous prime is 20133375109. The next prime is 20133375181. The reversal of 20133375138 is 83157333102.

20133375138 is a `hidden beast` number, since 2 + 0 + 133 + 3 + 7 + 513 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 187543 + ... + 274661.

It is an arithmetic number, because the mean of its divisors is an integer number (936060840).

Almost surely, 2^20133375138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20133375138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22465460160).

20133375138 is an abundant number, since it is smaller than the sum of its proper divisors (24797545182).

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

20133375138 is a wasteful number, since it uses less digits than its factorization.

20133375138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87511 (or 87508 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 20133375138 in words is "twenty billion, one hundred thirty-three million, three hundred seventy-five thousand, one hundred thirty-eight".