20722503 has 4 divisors (see below), whose sum is σ = 27630008. Its totient is φ = 13815000.

The previous prime is 20722453. The next prime is 20722519. The reversal of 20722503 is 30522702.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20722503 - 2⁹ = 20721991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20722503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722543) 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, 3453748 + ... + 3453753.

It is an arithmetic number, because the mean of its divisors is an integer number (6907502).

Almost surely, 2^20722503 is an apocalyptic number.

20722503 is a deficient number, since it is larger than the sum of its proper divisors (6907505).

20722503 is an equidigital number, since it uses as much as digits as its factorization.

20722503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6907504.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20722503 is about 4552.1976011592. The cubic root of 20722503 is about 274.6717979909.

The spelling of 20722503 in words is "twenty million, seven hundred twenty-two thousand, five hundred three".