20534261 has 4 divisors (see below), whose sum is σ = 22401024. Its totient is φ = 18667500.

The previous prime is 20534257. The next prime is 20534273. The reversal of 20534261 is 16243502.

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 not a de Polignac number, because 20534261 - 2² = 20534257 is a prime.

It is a super-2 number, since 2×20534261² = 843311749632242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534281) 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, 933365 + ... + 933386.

It is an arithmetic number, because the mean of its divisors is an integer number (5600256).

Almost surely, 2^20534261 is an apocalyptic number.

It is an amenable number.

20534261 is a deficient number, since it is larger than the sum of its proper divisors (1866763).

20534261 is a wasteful number, since it uses less digits than its factorization.

20534261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866762.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20534261 is about 4531.4744840946. The cubic root of 20534261 is about 273.8375660041.

Adding to 20534261 its reverse (16243502), we get a palindrome (36777763).

The spelling of 20534261 in words is "twenty million, five hundred thirty-four thousand, two hundred sixty-one".