20428073 has 4 divisors (see below), whose sum is σ = 20452608. Its totient is φ = 20403540.

The previous prime is 20428069. The next prime is 20428141. The reversal of 20428073 is 37082402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20428073 - 2² = 20428069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20428003) 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, 10973 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (5113152).

Almost surely, 2^20428073 is an apocalyptic number.

It is an amenable number.

20428073 is a deficient number, since it is larger than the sum of its proper divisors (24535).

20428073 is an equidigital number, since it uses as much as digits as its factorization.

20428073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24534.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20428073 is about 4519.7425811654. The cubic root of 20428073 is about 273.3647215920.

The spelling of 20428073 in words is "twenty million, four hundred twenty-eight thousand, seventy-three".