20938578192 has 160 divisors (see below), whose sum is σ = 69655541760. Its totient is φ = 5898130560.

The previous prime is 20938578191. The next prime is 20938578209. The reversal of 20938578192 is 29187583902.

20938578192 is a `hidden beast` number, since 2 + 0 + 9 + 385 + 78 + 192 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20938578191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165943 + ... + 263465.

It is an arithmetic number, because the mean of its divisors is an integer number (435347136).

Almost surely, 2^20938578192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938578192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34827770880).

20938578192 is an abundant number, since it is smaller than the sum of its proper divisors (48716963568).

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

20938578192 is a wasteful number, since it uses less digits than its factorization.

20938578192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97618 (or 97606 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 20938578192 in words is "twenty billion, nine hundred thirty-eight million, five hundred seventy-eight thousand, one hundred ninety-two".