20645703 has 12 divisors (see below), whose sum is σ = 32115720. Its totient is φ = 12704976.

The previous prime is 20645683. The next prime is 20645707. The reversal of 20645703 is 30754602.

It is a happy number.

20645703 is a `hidden beast` number, since 206 + 457 + 0 + 3 = 666.

It is not a de Polignac number, because 20645703 - 2⁵ = 20645671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645707) 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, 88113 + ... + 88346.

It is an arithmetic number, because the mean of its divisors is an integer number (2676310).

Almost surely, 2^20645703 is an apocalyptic number.

20645703 is a deficient number, since it is larger than the sum of its proper divisors (11470017).

20645703 is a wasteful number, since it uses less digits than its factorization.

20645703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176478 (or 176475 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20645703 is about 4543.7542847298. The cubic root of 20645703 is about 274.3320560882.

The spelling of 20645703 in words is "twenty million, six hundred forty-five thousand, seven hundred three".