20534561 has 8 divisors (see below), whose sum is σ = 21518784. Its totient is φ = 19558000.

The previous prime is 20534543. The next prime is 20534567. The reversal of 20534561 is 16543502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20534561 - 2¹⁴ = 20518177 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 20534561.

It is not an unprimeable number, because it can be changed into a prime (20534567) 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 7 ways as a sum of consecutive naturals, for example, 3995 + ... + 7551.

It is an arithmetic number, because the mean of its divisors is an integer number (2689848).

Almost surely, 2^20534561 is an apocalyptic number.

It is an amenable number.

20534561 is a deficient number, since it is larger than the sum of its proper divisors (984223).

20534561 is a wasteful number, since it uses less digits than its factorization.

20534561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 20534561 is about 4531.5075857820. The cubic root of 20534561 is about 273.8388995619.

The spelling of 20534561 in words is "twenty million, five hundred thirty-four thousand, five hundred sixty-one".