20842427 has 6 divisors (see below), whose sum is σ = 21162708. Its totient is φ = 20526924.

The previous prime is 20842421. The next prime is 20842429. The reversal of 20842427 is 72424802.

It is not a de Polignac number, because 20842427 - 2¹⁸ = 20580283 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 20842427.

It is not an unprimeable number, because it can be changed into a prime (20842421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2168 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (3527118).

Almost surely, 2^20842427 is an apocalyptic number.

20842427 is a deficient number, since it is larger than the sum of its proper divisors (320281).

20842427 is an frugal number, since it uses more digits than its factorization.

20842427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777 (or 4710 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20842427 is about 4565.3506984678. The cubic root of 20842427 is about 275.2006337519.

The spelling of 20842427 in words is "twenty million, eight hundred forty-two thousand, four hundred twenty-seven".