20997173471 has 8 divisors (see below), whose sum is σ = 21202510560. Its totient is φ = 20792067552.

The previous prime is 20997173411. The next prime is 20997173473. The reversal of 20997173471 is 17437179902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20997173471 is a prime.

It is a super-3 number, since 3×20997173471³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20997173473) 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, 127646 + ... + 241428.

It is an arithmetic number, because the mean of its divisors is an integer number (2650313820).

Almost surely, 2^20997173471 is an apocalyptic number.

20997173471 is a deficient number, since it is larger than the sum of its proper divisors (205337089).

20997173471 is a wasteful number, since it uses less digits than its factorization.

20997173471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115585.

The product of its (nonzero) digits is 666792, while the sum is 50.

The spelling of 20997173471 in words is "twenty billion, nine hundred ninety-seven million, one hundred seventy-three thousand, four hundred seventy-one".