20712291 has 4 divisors (see below), whose sum is σ = 27616392. Its totient is φ = 13808192.

The previous prime is 20712287. The next prime is 20712301. The reversal of 20712291 is 19221702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20712291 - 2² = 20712287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20712221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3452046 + ... + 3452051.

It is an arithmetic number, because the mean of its divisors is an integer number (6904098).

Almost surely, 2^20712291 is an apocalyptic number.

20712291 is a deficient number, since it is larger than the sum of its proper divisors (6904101).

20712291 is an equidigital number, since it uses as much as digits as its factorization.

20712291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904100.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 20712291 is about 4551.0758068835. The cubic root of 20712291 is about 274.6266713753.

Adding to 20712291 its reverse (19221702), we get a palindrome (39933993).

The spelling of 20712291 in words is "twenty million, seven hundred twelve thousand, two hundred ninety-one".