20627261 has 4 divisors (see below), whose sum is σ = 20734332. Its totient is φ = 20520192.

The previous prime is 20627249. The next prime is 20627281. The reversal of 20627261 is 16272602.

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 9803161 + 10824100 = 3131^2 + 3290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20627261 - 2⁶ = 20627197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20627261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20627221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53246 + ... + 53631.

It is an arithmetic number, because the mean of its divisors is an integer number (5183583).

Almost surely, 2^20627261 is an apocalyptic number.

It is an amenable number.

20627261 is a deficient number, since it is larger than the sum of its proper divisors (107071).

20627261 is a wasteful number, since it uses less digits than its factorization.

20627261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107070.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20627261 is about 4541.7244522318. The cubic root of 20627261 is about 274.2503483849.

Adding to 20627261 its reverse (16272602), we get a palindrome (36899863).

The spelling of 20627261 in words is "twenty million, six hundred twenty-seven thousand, two hundred sixty-one".