20809342 has 8 divisors (see below), whose sum is σ = 32571216. Its totient is φ = 9952272.

The previous prime is 20809303. The next prime is 20809361. The reversal of 20809342 is 24390802.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20809342.

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, 226143 + ... + 226234.

It is an arithmetic number, because the mean of its divisors is an integer number (4071402).

Almost surely, 2^20809342 is an apocalyptic number.

20809342 is a deficient number, since it is larger than the sum of its proper divisors (11761874).

20809342 is a wasteful number, since it uses less digits than its factorization.

20809342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452402.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20809342 is about 4561.7257699252. The cubic root of 20809342 is about 275.0549399874.

The spelling of 20809342 in words is "twenty million, eight hundred nine thousand, three hundred forty-two".