20428573 has 8 divisors (see below), whose sum is σ = 22664160. Its totient is φ = 18256080.

The previous prime is 20428567. The next prime is 20428579. The reversal of 20428573 is 37582402.

It is an interprime number because it is at equal distance from previous prime (20428567) and next prime (20428579).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20428573 - 2⁹ = 20428061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15090 + ... + 16387.

It is an arithmetic number, because the mean of its divisors is an integer number (2833020).

Almost surely, 2^20428573 is an apocalyptic number.

It is an amenable number.

20428573 is a deficient number, since it is larger than the sum of its proper divisors (2235587).

20428573 is a wasteful number, since it uses less digits than its factorization.

20428573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31547.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20428573 is about 4519.7978937116. The cubic root of 20428573 is about 273.3669518766.

The spelling of 20428573 in words is "twenty million, four hundred twenty-eight thousand, five hundred seventy-three".