20949427 has 4 divisors (see below), whose sum is σ = 20961576. Its totient is φ = 20937280.

The previous prime is 20949421. The next prime is 20949499. The reversal of 20949427 is 72494902.

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 20949427 - 2²³ = 12560819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20949421) 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, 2953 + ... + 7114.

It is an arithmetic number, because the mean of its divisors is an integer number (5240394).

Almost surely, 2^20949427 is an apocalyptic number.

20949427 is a deficient number, since it is larger than the sum of its proper divisors (12149).

20949427 is a wasteful number, since it uses less digits than its factorization.

20949427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12148.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20949427 is about 4577.0544021237. The cubic root of 20949427 is about 275.6707680710.

The spelling of 20949427 in words is "twenty million, nine hundred forty-nine thousand, four hundred twenty-seven".