20753261 has 4 divisors (see below), whose sum is σ = 20762400. Its totient is φ = 20744124.

The previous prime is 20753251. The next prime is 20753267. The reversal of 20753261 is 16235702.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20753261 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 20753261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20753267) 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, 1760 + ... + 6678.

It is an arithmetic number, because the mean of its divisors is an integer number (5190600).

Almost surely, 2^20753261 is an apocalyptic number.

It is an amenable number.

20753261 is a deficient number, since it is larger than the sum of its proper divisors (9139).

20753261 is an equidigital number, since it uses as much as digits as its factorization.

20753261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9138.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20753261 is about 4555.5747167619. The cubic root of 20753261 is about 274.8076274432.

Adding to 20753261 its reverse (16235702), we get a palindrome (36988963).

The spelling of 20753261 in words is "twenty million, seven hundred fifty-three thousand, two hundred sixty-one".