20573561 has 8 divisors (see below), whose sum is σ = 21721920. Its totient is φ = 19431792.

The previous prime is 20573549. The next prime is 20573573. The reversal of 20573561 is 16537502.

It is an interprime number because it is at equal distance from previous prime (20573549) and next prime (20573573).

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 20573561 - 2¹⁰ = 20572537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20573521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5636 + ... + 8538.

It is an arithmetic number, because the mean of its divisors is an integer number (2715240).

Almost surely, 2^20573561 is an apocalyptic number.

It is an amenable number.

20573561 is a deficient number, since it is larger than the sum of its proper divisors (1148359).

20573561 is a wasteful number, since it uses less digits than its factorization.

20573561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3295.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20573561 is about 4535.8087481727. The cubic root of 20573561 is about 274.0121515914.

The spelling of 20573561 in words is "twenty million, five hundred seventy-three thousand, five hundred sixty-one".