20732445 has 12 divisors (see below), whose sum is σ = 35936316. Its totient is φ = 11057280.

The previous prime is 20732441. The next prime is 20732471. The reversal of 20732445 is 54423702.

It can be written as a sum of positive squares in 2 ways, for example, as 12830724 + 7901721 = 3582^2 + 2811^2 .

It is not a de Polignac number, because 20732445 - 2² = 20732441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20732441) 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 11 ways as a sum of consecutive naturals, for example, 230316 + ... + 230405.

It is an arithmetic number, because the mean of its divisors is an integer number (2994693).

Almost surely, 2^20732445 is an apocalyptic number.

It is an amenable number.

20732445 is a deficient number, since it is larger than the sum of its proper divisors (15203871).

20732445 is a wasteful number, since it uses less digits than its factorization.

20732445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460732 (or 460729 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 20732445 is about 4553.2894702621. The cubic root of 20732445 is about 274.7157172417.

The spelling of 20732445 in words is "twenty million, seven hundred thirty-two thousand, four hundred forty-five".