20830431 has 8 divisors (see below), whose sum is σ = 28298160. Its totient is φ = 13624832.

The previous prime is 20830429. The next prime is 20830471. The reversal of 20830431 is 13403802.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20830431 - 2¹ = 20830429 is a prime.

It is a super-2 number, since 2×20830431² = 867813711291522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20830398 and 20830407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830421) 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, 65346 + ... + 65663.

It is an arithmetic number, because the mean of its divisors is an integer number (3537270).

Almost surely, 2^20830431 is an apocalyptic number.

20830431 is a deficient number, since it is larger than the sum of its proper divisors (7467729).

20830431 is a wasteful number, since it uses less digits than its factorization.

20830431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131065.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20830431 is about 4564.0367001154. The cubic root of 20830431 is about 275.1478257565.

It can be divided in two parts, 208304 and 31, that added together give a triangular number (208335 = T₆₄₅).

The spelling of 20830431 in words is "twenty million, eight hundred thirty thousand, four hundred thirty-one".