20136872 has 16 divisors (see below), whose sum is σ = 43150560. Its totient is φ = 8630064.

The previous prime is 20136871. The next prime is 20136899. The reversal of 20136872 is 27863102.

It is a happy number.

It is a super-2 number, since 2×20136872² = 810987227888768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20136871) 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, 179738 + ... + 179849.

It is an arithmetic number, because the mean of its divisors is an integer number (2696910).

Almost surely, 2^20136872 is an apocalyptic number.

It is an amenable number.

20136872 is an abundant number, since it is smaller than the sum of its proper divisors (23013688).

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

20136872 is a wasteful number, since it uses less digits than its factorization.

20136872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359600 (or 359596 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20136872 is about 4487.4126175336. The cubic root of 20136872 is about 272.0595674037.

Adding to 20136872 its reverse (27863102), we get a palindrome (47999974).

It can be divided in two parts, 201 and 36872, that added together give a palindrome (37073).

The spelling of 20136872 in words is "twenty million, one hundred thirty-six thousand, eight hundred seventy-two".