20587061 has 6 divisors (see below), whose sum is σ = 22628886. Its totient is φ = 18715400.

The previous prime is 20587037. The next prime is 20587079. The reversal of 20587061 is 16078502.

20587061 = 351² + 352² + ... + 471².

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 7806436 = 3575^2 + 2794^2 .

It is not a de Polignac number, because 20587061 - 2¹⁰ = 20586037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20587661) 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 5 ways as a sum of consecutive naturals, for example, 84950 + ... + 85191.

It is an arithmetic number, because the mean of its divisors is an integer number (3771481).

Almost surely, 2^20587061 is an apocalyptic number.

It is an amenable number.

20587061 is a deficient number, since it is larger than the sum of its proper divisors (2041825).

20587061 is a wasteful number, since it uses less digits than its factorization.

20587061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170163 (or 170152 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20587061 is about 4537.2966621106. The cubic root of 20587061 is about 274.0720724324.

It can be divided in two parts, 2058 and 7061, that added together give a palindrome (9119).

The spelling of 20587061 in words is "twenty million, five hundred eighty-seven thousand, sixty-one".