20871137 has 8 divisors (see below), whose sum is σ = 23894976. Its totient is φ = 17857872.

The previous prime is 20871133. The next prime is 20871157. The reversal of 20871137 is 73117802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20871137 - 2² = 20871133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20871131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2183 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (2986872).

Almost surely, 2^20871137 is an apocalyptic number.

It is an amenable number.

20871137 is a deficient number, since it is larger than the sum of its proper divisors (3023839).

20871137 is an equidigital number, since it uses as much as digits as its factorization.

20871137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 20871137 is about 4568.4939531535. The cubic root of 20871137 is about 275.3269367834.

Adding to 20871137 its reverse (73117802), we get a palindrome (93988939).

The spelling of 20871137 in words is "twenty million, eight hundred seventy-one thousand, one hundred thirty-seven".