20543201 has 6 divisors (see below), whose sum is σ = 23897250. Its totient is φ = 17608416.

The previous prime is 20543197. The next prime is 20543221. The reversal of 20543201 is 10234502.

It can be written as a sum of positive squares in only one way, i.e., 17230801 + 3312400 = 4151^2 + 1820^2 .

It is not a de Polignac number, because 20543201 - 2² = 20543197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20543201.

It is not an unprimeable number, because it can be changed into a prime (20543221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209576 + ... + 209673.

It is an arithmetic number, because the mean of its divisors is an integer number (3982875).

Almost surely, 2^20543201 is an apocalyptic number.

It is an amenable number.

20543201 is a deficient number, since it is larger than the sum of its proper divisors (3354049).

20543201 is an equidigital number, since it uses as much as digits as its factorization.

20543201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419263 (or 419256 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20543201 is about 4532.4608106414. The cubic root of 20543201 is about 273.8773004533.

Adding to 20543201 its reverse (10234502), we get a palindrome (30777703).

The spelling of 20543201 in words is "twenty million, five hundred forty-three thousand, two hundred one".