20564461 has 8 divisors (see below), whose sum is σ = 21571200. Its totient is φ = 19567152.

The previous prime is 20564459. The next prime is 20564473. The reversal of 20564461 is 16446502.

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 20564461 - 2¹ = 20564459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564431) 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, 2331 + ... + 6823.

It is an arithmetic number, because the mean of its divisors is an integer number (2696400).

Almost surely, 2^20564461 is an apocalyptic number.

It is an amenable number.

20564461 is a deficient number, since it is larger than the sum of its proper divisors (1006739).

20564461 is a wasteful number, since it uses less digits than its factorization.

20564461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20564461 is about 4534.8055085086. The cubic root of 20564461 is about 273.9717457146.

It can be divided in two parts, 20564 and 461, that added together give a square (21025 = 145²).

The spelling of 20564461 in words is "twenty million, five hundred sixty-four thousand, four hundred sixty-one".