20682431 has 32 divisors (see below), whose sum is σ = 27678720. Its totient is φ = 14968800.

The previous prime is 20682427. The next prime is 20682461. The reversal of 20682431 is 13428602.

It is not a de Polignac number, because 20682431 - 2² = 20682427 is a prime.

It is a super-2 number, since 2×20682431² = 855525904139522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20682431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682461) 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 31 ways as a sum of consecutive naturals, for example, 97916 + ... + 98126.

It is an arithmetic number, because the mean of its divisors is an integer number (864960).

Almost surely, 2^20682431 is an apocalyptic number.

20682431 is a deficient number, since it is larger than the sum of its proper divisors (6996289).

20682431 is a wasteful number, since it uses less digits than its factorization.

20682431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20682431 is about 4547.7940806505. The cubic root of 20682431 is about 274.4946355024.

The spelling of 20682431 in words is "twenty million, six hundred eighty-two thousand, four hundred thirty-one".