20532261 has 32 divisors (see below), whose sum is σ = 30597120. Its totient is φ = 12196800.

The previous prime is 20532233. The next prime is 20532263. The reversal of 20532261 is 16223502.

It is not a de Polignac number, because 20532261 - 2⁷ = 20532133 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20532263) 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 31 ways as a sum of consecutive naturals, for example, 61866 + ... + 62196.

It is an arithmetic number, because the mean of its divisors is an integer number (956160).

Almost surely, 2^20532261 is an apocalyptic number.

It is an amenable number.

20532261 is a deficient number, since it is larger than the sum of its proper divisors (10064859).

20532261 is a wasteful number, since it uses less digits than its factorization.

20532261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20532261 is about 4531.2537999984. The cubic root of 20532261 is about 273.8286752871.

Adding to 20532261 its reverse (16223502), we get a palindrome (36755763).

The spelling of 20532261 in words is "twenty million, five hundred thirty-two thousand, two hundred sixty-one".