19520431 has 4 divisors (see below), whose sum is σ = 22309072. Its totient is φ = 16731792.

The previous prime is 19520407. The next prime is 19520447. The reversal of 19520431 is 13402591.

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

It is not a de Polignac number, because 19520431 - 2²¹ = 17423279 is a prime.

It is a super-2 number, since 2×19520431² = 762094452851522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19520396 and 19520405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19520461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394310 + ... + 1394323.

It is an arithmetic number, because the mean of its divisors is an integer number (5577268).

Almost surely, 2^19520431 is an apocalyptic number.

19520431 is a deficient number, since it is larger than the sum of its proper divisors (2788641).

19520431 is an equidigital number, since it uses as much as digits as its factorization.

19520431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788640.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 19520431 is about 4418.1931827388. The cubic root of 19520431 is about 269.2546015680.

The spelling of 19520431 in words is "nineteen million, five hundred twenty thousand, four hundred thirty-one".