20343431 has 4 divisors (see below), whose sum is σ = 21227952. Its totient is φ = 19458912.

The previous prime is 20343419. The next prime is 20343473. The reversal of 20343431 is 13434302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20343431 - 2²² = 16149127 is a prime.

It is a super-2 number, since 2×20343431² = 827710369703522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20343481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442226 + ... + 442271.

It is an arithmetic number, because the mean of its divisors is an integer number (5306988).

Almost surely, 2^20343431 is an apocalyptic number.

20343431 is a deficient number, since it is larger than the sum of its proper divisors (884521).

20343431 is an equidigital number, since it uses as much as digits as its factorization.

20343431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884520.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20343431 is about 4510.3692753476. The cubic root of 20343431 is about 272.9866443662.

Adding to 20343431 its reverse (13434302), we get a palindrome (33777733).

It can be divided in two parts, 203 and 43431, that added together give a palindrome (43634).

The spelling of 20343431 in words is "twenty million, three hundred forty-three thousand, four hundred thirty-one".