20428342 has 8 divisors (see below), whose sum is σ = 33428232. Its totient is φ = 9285600.

The previous prime is 20428319. The next prime is 20428379. The reversal of 20428342 is 24382402.

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

It is a super-3 number, since 3×20428342³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464259 + ... + 464302.

It is an arithmetic number, because the mean of its divisors is an integer number (4178529).

Almost surely, 2^20428342 is an apocalyptic number.

20428342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20428342 is a deficient number, since it is larger than the sum of its proper divisors (12999890).

20428342 is a wasteful number, since it uses less digits than its factorization.

20428342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928574.

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

The square root of 20428342 is about 4519.7723393994. The cubic root of 20428342 is about 273.3659214896.

The spelling of 20428342 in words is "twenty million, four hundred twenty-eight thousand, three hundred forty-two".