20172012 has 96 divisors (see below), whose sum is σ = 57480192. Its totient is φ = 5381376.

The previous prime is 20172007. The next prime is 20172037. The reversal of 20172012 is 21027102.

It is a junction number, because it is equal to n+sod(n) for n = 20171982 and 20172000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102298 + ... + 102494.

It is an arithmetic number, because the mean of its divisors is an integer number (598752).

Almost surely, 2^20172012 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 20172012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28740096).

20172012 is an abundant number, since it is smaller than the sum of its proper divisors (37308180).

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

20172012 is a wasteful number, since it uses less digits than its factorization.

20172012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 20172012 is about 4491.3263074508. The cubic root of 20172012 is about 272.2177286376.

Adding to 20172012 its reverse (21027102), we get a palindrome (41199114).

The spelling of 20172012 in words is "twenty million, one hundred seventy-two thousand, twelve".