20712427 has 4 divisors (see below), whose sum is σ = 20762280. Its totient is φ = 20662576.

The previous prime is 20712403. The next prime is 20712431. The reversal of 20712427 is 72421702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20712427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20712437) 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, 24298 + ... + 25135.

It is an arithmetic number, because the mean of its divisors is an integer number (5190570).

Almost surely, 2^20712427 is an apocalyptic number.

20712427 is a deficient number, since it is larger than the sum of its proper divisors (49853).

20712427 is an equidigital number, since it uses as much as digits as its factorization.

20712427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49852.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 20712427 is about 4551.0907483811. The cubic root of 20712427 is about 274.6272724539.

The spelling of 20712427 in words is "twenty million, seven hundred twelve thousand, four hundred twenty-seven".