20207261 has 4 divisors (see below), whose sum is σ = 20403552. Its totient is φ = 20010972.

The previous prime is 20207251. The next prime is 20207269. The reversal of 20207261 is 16270202.

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 a de Polignac number, because none of the positive numbers 2^k-20207261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20207269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97991 + ... + 98196.

It is an arithmetic number, because the mean of its divisors is an integer number (5100888).

Almost surely, 2^20207261 is an apocalyptic number.

It is an amenable number.

20207261 is a deficient number, since it is larger than the sum of its proper divisors (196291).

20207261 is a wasteful number, since it uses less digits than its factorization.

20207261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196290.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20207261 is about 4495.2487139201. The cubic root of 20207261 is about 272.3761960407.

Adding to 20207261 its reverse (16270202), we get a palindrome (36477463).

The spelling of 20207261 in words is "twenty million, two hundred seven thousand, two hundred sixty-one".