20487703 has 4 divisors (see below), whose sum is σ = 21692880. Its totient is φ = 19282528.

The previous prime is 20487697. The next prime is 20487713. The reversal of 20487703 is 30778402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30778402 = 2 ⋅15389201.

It is a cyclic number.

It is not a de Polignac number, because 20487703 - 2⁵ = 20487671 is a prime.

It is a super-3 number, since 3×20487703³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20487713) 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, 602563 + ... + 602596.

It is an arithmetic number, because the mean of its divisors is an integer number (5423220).

Almost surely, 2^20487703 is an apocalyptic number.

20487703 is a deficient number, since it is larger than the sum of its proper divisors (1205177).

20487703 is a wasteful number, since it uses less digits than its factorization.

20487703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205176.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20487703 is about 4526.3343888847. The cubic root of 20487703 is about 273.6304491080.

The spelling of 20487703 in words is "twenty million, four hundred eighty-seven thousand, seven hundred three".