19905431325 has 144 divisors (see below), whose sum is σ = 38589988416. Its totient is φ = 8992972800.

The previous prime is 19905431323. The next prime is 19905431327. The reversal of 19905431325 is 52313450991.

It is an interprime number because it is at equal distance from previous prime (19905431323) and next prime (19905431327).

It is not a de Polignac number, because 19905431325 - 2¹ = 19905431323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19905431323) 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 143 ways as a sum of consecutive naturals, for example, 11551914 + ... + 11553636.

Almost surely, 2^19905431325 is an apocalyptic number.

19905431325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19905431325 is a deficient number, since it is larger than the sum of its proper divisors (18684557091).

19905431325 is a wasteful number, since it uses less digits than its factorization.

19905431325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1802 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The spelling of 19905431325 in words is "nineteen billion, nine hundred five million, four hundred thirty-one thousand, three hundred twenty-five".