19905345 has 56 divisors (see below), whose sum is σ = 36934656. Its totient is φ = 10287648.

The previous prime is 19905343. The next prime is 19905349. The reversal of 19905345 is 54350991.

It is not a de Polignac number, because 19905345 - 2¹ = 19905343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19905341) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 156672 + ... + 156798.

Almost surely, 2^19905345 is an apocalyptic number.

19905345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19905345 is a deficient number, since it is larger than the sum of its proper divisors (17029311).

19905345 is an equidigital number, since it uses as much as digits as its factorization.

19905345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 19905345 is about 4461.5406531825. The cubic root of 19905345 is about 271.0128623226.

The spelling of 19905345 in words is "nineteen million, nine hundred five thousand, three hundred forty-five".