20171852 has 6 divisors (see below), whose sum is σ = 35300748. Its totient is φ = 10085924.

The previous prime is 20171813. The next prime is 20171857. The reversal of 20171852 is 25817102.

It is a super-2 number, since 2×20171852² = 813807226219808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20171857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2521478 + ... + 2521485.

It is an arithmetic number, because the mean of its divisors is an integer number (5883458).

Almost surely, 2^20171852 is an apocalyptic number.

It is an amenable number.

20171852 is a deficient number, since it is larger than the sum of its proper divisors (15128896).

20171852 is a wasteful number, since it uses less digits than its factorization.

20171852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042967 (or 5042965 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 20171852 is about 4491.3084953051. The cubic root of 20171852 is about 272.2170089118.

Adding to 20171852 its reverse (25817102), we get a palindrome (45988954).

The spelling of 20171852 in words is "twenty million, one hundred seventy-one thousand, eight hundred fifty-two".