20085431 has 8 divisors (see below), whose sum is σ = 20482560. Its totient is φ = 19692288.

The previous prime is 20085397. The next prime is 20085467. The reversal of 20085431 is 13458002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20085431 is a prime.

It is a super-2 number, since 2×20085431² = 806849076911522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20085397 and 20085406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20085491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10415 + ... + 12191.

It is an arithmetic number, because the mean of its divisors is an integer number (2560320).

Almost surely, 2^20085431 is an apocalyptic number.

20085431 is a deficient number, since it is larger than the sum of its proper divisors (397129).

20085431 is a wasteful number, since it uses less digits than its factorization.

20085431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20085431 is about 4481.6772529936. The cubic root of 20085431 is about 271.8277050069.

The spelling of 20085431 in words is "twenty million, eighty-five thousand, four hundred thirty-one".