20136172 has 12 divisors (see below), whose sum is σ = 40272400. Its totient is φ = 8629776.

The previous prime is 20136167. The next prime is 20136173. The reversal of 20136172 is 27163102.

20136172 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20136173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359547 + ... + 359602.

Almost surely, 2^20136172 is an apocalyptic number.

It is an amenable number.

20136172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20136172 is a wasteful number, since it uses less digits than its factorization.

20136172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719160 (or 719158 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20136172 is about 4487.3346209081. The cubic root of 20136172 is about 272.0564149131.

Adding to 20136172 its reverse (27163102), we get a palindrome (47299274).

The spelling of 20136172 in words is "twenty million, one hundred thirty-six thousand, one hundred seventy-two".