20723285 has 8 divisors (see below), whose sum is σ = 27128736. Its totient is φ = 15071440.

The previous prime is 20723251. The next prime is 20723317. The reversal of 20723285 is 58232702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20723285 - 2⁸ = 20723029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 188339 + ... + 188448.

It is an arithmetic number, because the mean of its divisors is an integer number (3391092).

Almost surely, 2^20723285 is an apocalyptic number.

It is an amenable number.

20723285 is a deficient number, since it is larger than the sum of its proper divisors (6405451).

20723285 is a wasteful number, since it uses less digits than its factorization.

20723285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376803.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20723285 is about 4552.2834929297. The cubic root of 20723285 is about 274.6752530215.

Adding to 20723285 its reverse (58232702), we get a palindrome (78955987).

The spelling of 20723285 in words is "twenty million, seven hundred twenty-three thousand, two hundred eighty-five".