20723573 has 16 divisors (see below), whose sum is σ = 23284800. Its totient is φ = 18318720.

The previous prime is 20723567. The next prime is 20723581. The reversal of 20723573 is 37532702.

It is a cyclic number.

It is not a de Polignac number, because 20723573 - 2⁴ = 20723557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31118 + ... + 31776.

It is an arithmetic number, because the mean of its divisors is an integer number (1455300).

Almost surely, 2^20723573 is an apocalyptic number.

It is an amenable number.

20723573 is a deficient number, since it is larger than the sum of its proper divisors (2561227).

20723573 is a wasteful number, since it uses less digits than its factorization.

20723573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 8820, while the sum is 29.

The square root of 20723573 is about 4552.3151252961. The cubic root of 20723573 is about 274.6765254405.

The spelling of 20723573 in words is "twenty million, seven hundred twenty-three thousand, five hundred seventy-three".