20460564 has 18 divisors (see below), whose sum is σ = 51719850. Its totient is φ = 6820176.

The previous prime is 20460553. The next prime is 20460569. The reversal of 20460564 is 46506402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 7064964 = 3660^2 + 2658^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20460569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284139 + ... + 284210.

It is an arithmetic number, because the mean of its divisors is an integer number (2873325).

Almost surely, 2^20460564 is an apocalyptic number.

It is an amenable number.

20460564 is an abundant number, since it is smaller than the sum of its proper divisors (31259286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20460564 is a wasteful number, since it uses less digits than its factorization.

20460564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568359 (or 568354 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20460564 is about 4523.3354949639. The cubic root of 20460564 is about 273.5095743545.

Adding to 20460564 its reverse (46506402), we get a palindrome (66966966).

The spelling of 20460564 in words is "twenty million, four hundred sixty thousand, five hundred sixty-four".