20158746972 has 96 divisors (see below), whose sum is σ = 57921292800. Its totient is φ = 5313883392.

The previous prime is 20158746961. The next prime is 20158747009. The reversal of 20158746972 is 27964785102.

It is a happy number.

It is a super-2 number, since 2×20158746972² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3042279 + ... + 3048897.

It is an arithmetic number, because the mean of its divisors is an integer number (603346800).

Almost surely, 2^20158746972 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 20158746972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28960646400).

20158746972 is an abundant number, since it is smaller than the sum of its proper divisors (37762545828).

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

20158746972 is a wasteful number, since it uses less digits than its factorization.

20158746972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9435 (or 9433 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 20158746972 in words is "twenty billion, one hundred fifty-eight million, seven hundred forty-six thousand, nine hundred seventy-two".