20723506 has 16 divisors (see below), whose sum is σ = 33194304. Its totient is φ = 9679824.

The previous prime is 20723503. The next prime is 20723513. The reversal of 20723506 is 60532702.

It is not an unprimeable number, because it can be changed into a prime (20723503) 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 7 ways as a sum of consecutive naturals, for example, 3261 + ... + 7216.

It is an arithmetic number, because the mean of its divisors is an integer number (2074644).

Almost surely, 2^20723506 is an apocalyptic number.

20723506 is a deficient number, since it is larger than the sum of its proper divisors (12470798).

20723506 is a wasteful number, since it uses less digits than its factorization.

20723506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10545.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20723506 is about 4552.3077663972. The cubic root of 20723506 is about 274.6762294274.

The spelling of 20723506 in words is "twenty million, seven hundred twenty-three thousand, five hundred six".