20731201 has 4 divisors (see below), whose sum is σ = 21446100. Its totient is φ = 20016304.

The previous prime is 20731189. The next prime is 20731231. The reversal of 20731201 is 10213702.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10233601 + 10497600 = 3199^2 + 3240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20731201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20731231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357406 + ... + 357463.

It is an arithmetic number, because the mean of its divisors is an integer number (5361525).

Almost surely, 2^20731201 is an apocalyptic number.

It is an amenable number.

20731201 is a deficient number, since it is larger than the sum of its proper divisors (714899).

20731201 is an equidigital number, since it uses as much as digits as its factorization.

20731201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714898.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20731201 is about 4553.1528636759. The cubic root of 20731201 is about 274.7102225820.

Adding to 20731201 its reverse (10213702), we get a palindrome (30944903).

The spelling of 20731201 in words is "twenty million, seven hundred thirty-one thousand, two hundred one".