20552461 has 4 divisors (see below), whose sum is σ = 20568924. Its totient is φ = 20536000.

The previous prime is 20552449. The next prime is 20552479. The reversal of 20552461 is 16425502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2996361 + 17556100 = 1731^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20552461 - 2⁷ = 20552333 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 (20552491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6190 + ... + 8911.

It is an arithmetic number, because the mean of its divisors is an integer number (5142231).

Almost surely, 2^20552461 is an apocalyptic number.

It is an amenable number.

20552461 is a deficient number, since it is larger than the sum of its proper divisors (16463).

20552461 is a wasteful number, since it uses less digits than its factorization.

20552461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16462.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20552461 is about 4533.4822156925. The cubic root of 20552461 is about 273.9184450124.

Adding to 20552461 its reverse (16425502), we get a palindrome (36977963).

The spelling of 20552461 in words is "twenty million, five hundred fifty-two thousand, four hundred sixty-one".