19952091 has 12 divisors (see below), whose sum is σ = 28875600. Its totient is φ = 13275600.

The previous prime is 19952077. The next prime is 19952099. The reversal of 19952091 is 19025991.

It is not a de Polignac number, because 19952091 - 2⁹ = 19951579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19952099) 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 11 ways as a sum of consecutive naturals, for example, 3541 + ... + 7241.

It is an arithmetic number, because the mean of its divisors is an integer number (2406300).

Almost surely, 2^19952091 is an apocalyptic number.

19952091 is a deficient number, since it is larger than the sum of its proper divisors (8923509).

19952091 is a wasteful number, since it uses less digits than its factorization.

19952091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306 (or 4303 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 19952091 is about 4466.7763543746. The cubic root of 19952091 is about 271.2248466415.

The spelling of 19952091 in words is "nineteen million, nine hundred fifty-two thousand, ninety-one".