20428343 has 4 divisors (see below), whose sum is σ = 21999768. Its totient is φ = 18856920.

The previous prime is 20428319. The next prime is 20428379. The reversal of 20428343 is 34382402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34382402 = 2 ⋅17191201.

It is a cyclic number.

It is not a de Polignac number, because 20428343 - 2¹² = 20424247 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 (20428643) 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, 785693 + ... + 785718.

It is an arithmetic number, because the mean of its divisors is an integer number (5499942).

Almost surely, 2^20428343 is an apocalyptic number.

20428343 is a deficient number, since it is larger than the sum of its proper divisors (1571425).

20428343 is a wasteful number, since it uses less digits than its factorization.

20428343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571424.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 20428343 is about 4519.7724500244. The cubic root of 20428343 is about 273.3659259502.

The spelling of 20428343 in words is "twenty million, four hundred twenty-eight thousand, three hundred forty-three".