19420431 has 4 divisors (see below), whose sum is σ = 25893912. Its totient is φ = 12946952.

The previous prime is 19420411. The next prime is 19420439. The reversal of 19420431 is 13402491.

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 19420431 - 2⁵ = 19420399 is a prime.

It is a super-2 number, since 2×19420431² = 754306280451522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3236736 + ... + 3236741.

It is an arithmetic number, because the mean of its divisors is an integer number (6473478).

Almost surely, 2^19420431 is an apocalyptic number.

19420431 is a deficient number, since it is larger than the sum of its proper divisors (6473481).

19420431 is an equidigital number, since it uses as much as digits as its factorization.

19420431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6473480.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 19420431 is about 4406.8618085890. The cubic root of 19420431 is about 268.7940316534.

The spelling of 19420431 in words is "nineteen million, four hundred twenty thousand, four hundred thirty-one".