20428799 has 2 divisors, whose sum is σ = 20428800. Its totient is φ = 20428798.

The previous prime is 20428777. The next prime is 20428801. The reversal of 20428799 is 99782402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20428799 - 2²⁰ = 19380223 is a prime.

Together with 20428801, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20428739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214399 + 10214400.

It is an arithmetic number, because the mean of its divisors is an integer number (10214400).

Almost surely, 2^20428799 is an apocalyptic number.

20428799 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428799 is an equidigital number, since it uses as much as digits as its factorization.

20428799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20428799 is about 4519.8228947604. The cubic root of 20428799 is about 273.3679599532.

The spelling of 20428799 in words is "twenty million, four hundred twenty-eight thousand, seven hundred ninety-nine".