20732085 has 64 divisors (see below), whose sum is σ = 42024960. Its totient is φ = 9599040.

The previous prime is 20732081. The next prime is 20732119. The reversal of 20732085 is 58023702.

It is not a de Polignac number, because 20732085 - 2² = 20732081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732081) 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 63 ways as a sum of consecutive naturals, for example, 33852 + ... + 34458.

It is an arithmetic number, because the mean of its divisors is an integer number (656640).

Almost surely, 2^20732085 is an apocalyptic number.

20732085 is the 2277-th decagonal number.

It is an amenable number.

20732085 is an abundant number, since it is smaller than the sum of its proper divisors (21292875).

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

20732085 is a wasteful number, since it uses less digits than its factorization.

20732085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20732085 is about 4553.2499382309. The cubic root of 20732085 is about 274.7141271699.

Adding to 20732085 its reverse (58023702), we get a palindrome (78755787).

The spelling of 20732085 in words is "twenty million, seven hundred thirty-two thousand, eighty-five".