20543353 has 4 divisors (see below), whose sum is σ = 20832768. Its totient is φ = 20253940.

The previous prime is 20543333. The next prime is 20543363. The reversal of 20543353 is 35334502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20543353 - 2⁵ = 20543321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543323) 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, 144601 + ... + 144742.

It is an arithmetic number, because the mean of its divisors is an integer number (5208192).

Almost surely, 2^20543353 is an apocalyptic number.

It is an amenable number.

20543353 is a deficient number, since it is larger than the sum of its proper divisors (289415).

20543353 is an equidigital number, since it uses as much as digits as its factorization.

20543353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289414.

The product of its (nonzero) digits is 5400, while the sum is 25.

The square root of 20543353 is about 4532.4775785435. The cubic root of 20543353 is about 273.8779759281.

Adding to 20543353 its reverse (35334502), we get a palindrome (55877855).

The spelling of 20543353 in words is "twenty million, five hundred forty-three thousand, three hundred fifty-three".