20680431 has 8 divisors (see below), whose sum is σ = 27690240. Its totient is φ = 13728792.

The previous prime is 20680411. The next prime is 20680433. The reversal of 20680431 is 13408602.

It is a happy number.

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

It is not a de Polignac number, because 20680431 - 2⁵ = 20680399 is a prime.

It is a super-2 number, since 2×20680431² = 855360452691522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13705 + ... + 15138.

It is an arithmetic number, because the mean of its divisors is an integer number (3461280).

Almost surely, 2^20680431 is an apocalyptic number.

20680431 is a deficient number, since it is larger than the sum of its proper divisors (7009809).

20680431 is a wasteful number, since it uses less digits than its factorization.

20680431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29085.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20680431 is about 4547.5741885097. The cubic root of 20680431 is about 274.4857873007.

The spelling of 20680431 in words is "twenty million, six hundred eighty thousand, four hundred thirty-one".