20020170172 has 24 divisors (see below), whose sum is σ = 35183756160. Its totient is φ = 9967754160.

The previous prime is 20020170167. The next prime is 20020170227. The reversal of 20020170172 is 27107102002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970647 + ... + 991057.

It is an arithmetic number, because the mean of its divisors is an integer number (1465989840).

Almost surely, 2^20020170172 is an apocalyptic number.

It is an amenable number.

20020170172 is a deficient number, since it is larger than the sum of its proper divisors (15163585988).

20020170172 is a wasteful number, since it uses less digits than its factorization.

20020170172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441 (or 21439 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 22.

Adding to 20020170172 its reverse (27107102002), we get a palindrome (47127272174).

The spelling of 20020170172 in words is "twenty billion, twenty million, one hundred seventy thousand, one hundred seventy-two".