20972897238058 has 4 divisors (see below), whose sum is σ = 31459345857090. Its totient is φ = 10486448619028.

The previous prime is 20972897238017. The next prime is 20972897238071. The reversal of 20972897238058 is 85083279827902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20963056002849 + 9841235209 = 4578543^2 + 99203^2 .

It is a super-3 number, since 3×20972897238058³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5243224309513 + ... + 5243224309516.

Almost surely, 2^{20972897238058} is an apocalyptic number.

20972897238058 is a deficient number, since it is larger than the sum of its proper divisors (10486448619032).

20972897238058 is a wasteful number, since it uses less digits than its factorization.

20972897238058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10486448619031.

The product of its (nonzero) digits is 243855360, while the sum is 70.

The spelling of 20972897238058 in words is "twenty trillion, nine hundred seventy-two billion, eight hundred ninety-seven million, two hundred thirty-eight thousand, fifty-eight".