20172797952 has 96 divisors (see below), whose sum is σ = 56611900800. Its totient is φ = 6370320384.

The previous prime is 20172797947. The next prime is 20172797987. The reversal of 20172797952 is 25979727102.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 20172797895 and 20172797904.

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, 30333 + ... + 203139.

It is an arithmetic number, because the mean of its divisors is an integer number (589707300).

Almost surely, 2^20172797952 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 20172797952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28305950400).

20172797952 is an abundant number, since it is smaller than the sum of its proper divisors (36439102848).

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

20172797952 is a wasteful number, since it uses less digits than its factorization.

20172797952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172851 (or 172831 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The spelling of 20172797952 in words is "twenty billion, one hundred seventy-two million, seven hundred ninety-seven thousand, nine hundred fifty-two".