20723685 has 16 divisors (see below), whose sum is σ = 33488640. Its totient is φ = 10942400.

The previous prime is 20723683. The next prime is 20723707. The reversal of 20723685 is 58632702.

It is not a de Polignac number, because 20723685 - 2¹ = 20723683 is a prime.

It is a super-2 number, since 2×20723685² = 858942239958450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723683) 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, 5325 + ... + 8354.

It is an arithmetic number, because the mean of its divisors is an integer number (2093040).

Almost surely, 2^20723685 is an apocalyptic number.

It is an amenable number.

20723685 is a deficient number, since it is larger than the sum of its proper divisors (12764955).

20723685 is a wasteful number, since it uses less digits than its factorization.

20723685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13788.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 20723685 is about 4552.3274267126. The cubic root of 20723685 is about 274.6770202670.

The spelling of 20723685 in words is "twenty million, seven hundred twenty-three thousand, six hundred eighty-five".