20349543 has 8 divisors (see below), whose sum is σ = 27710208. Its totient is φ = 13277624.

The previous prime is 20349491. The next prime is 20349557. The reversal of 20349543 is 34594302.

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 20349543 - 2⁶ = 20349479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20349543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20349643) 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, 72021 + ... + 72302.

It is an arithmetic number, because the mean of its divisors is an integer number (3463776).

Almost surely, 2^20349543 is an apocalyptic number.

20349543 is a deficient number, since it is larger than the sum of its proper divisors (7360665).

20349543 is a wasteful number, since it uses less digits than its factorization.

20349543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144373.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 20349543 is about 4511.0467743086. The cubic root of 20349543 is about 273.0139804189.

The spelling of 20349543 in words is "twenty million, three hundred forty-nine thousand, five hundred forty-three".