20513173971 has 8 divisors (see below), whose sum is σ = 27352215504. Its totient is φ = 13674790880.

The previous prime is 20513173957. The next prime is 20513173973. The reversal of 20513173971 is 17937131502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20513173971 - 2⁹ = 20513173459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20513173973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86640 + ... + 220301.

It is an arithmetic number, because the mean of its divisors is an integer number (3419026938).

Almost surely, 2^20513173971 is an apocalyptic number.

20513173971 is a deficient number, since it is larger than the sum of its proper divisors (6839041533).

20513173971 is a wasteful number, since it uses less digits than its factorization.

20513173971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329221.

The product of its (nonzero) digits is 39690, while the sum is 39.

The spelling of 20513173971 in words is "twenty billion, five hundred thirteen million, one hundred seventy-three thousand, nine hundred seventy-one".