20239427 has 16 divisors (see below), whose sum is σ = 23304960. Its totient is φ = 17420832.

The previous prime is 20239423. The next prime is 20239433. The reversal of 20239427 is 72493202.

It is a happy number.

It is not a de Polignac number, because 20239427 - 2² = 20239423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20239427.

It is not an unprimeable number, because it can be changed into a prime (20239423) 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 15 ways as a sum of consecutive naturals, for example, 15938 + ... + 17160.

It is an arithmetic number, because the mean of its divisors is an integer number (1456560).

Almost surely, 2^20239427 is an apocalyptic number.

20239427 is a deficient number, since it is larger than the sum of its proper divisors (3065533).

20239427 is a wasteful number, since it uses less digits than its factorization.

20239427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20239427 is about 4498.8250688374. The cubic root of 20239427 is about 272.5206426020.

The spelling of 20239427 in words is "twenty million, two hundred thirty-nine thousand, four hundred twenty-seven".