20428423 has 2 divisors, whose sum is σ = 20428424. Its totient is φ = 20428422.

The previous prime is 20428399. The next prime is 20428433. The reversal of 20428423 is 32482402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20428423 - 2⁵ = 20428391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20428433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214211 + 10214212.

It is an arithmetic number, because the mean of its divisors is an integer number (10214212).

Almost surely, 2^20428423 is an apocalyptic number.

20428423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20428423 is an equidigital number, since it uses as much as digits as its factorization.

20428423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20428423 is about 4519.7813000188. The cubic root of 20428423 is about 273.3662827950.

The spelling of 20428423 in words is "twenty million, four hundred twenty-eight thousand, four hundred twenty-three".