19888051 has 4 divisors (see below), whose sum is σ = 19900000. Its totient is φ = 19876104.

The previous prime is 19888021. The next prime is 19888061. The reversal of 19888051 is 15088891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19888051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19887995 and 19888013.

It is not an unprimeable number, because it can be changed into a prime (19888021) 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 3 ways as a sum of consecutive naturals, for example, 2976 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (4975000).

Almost surely, 2^19888051 is an apocalyptic number.

19888051 is the 2821-st centered pentagonal number.

19888051 is a deficient number, since it is larger than the sum of its proper divisors (11949).

19888051 is an equidigital number, since it uses as much as digits as its factorization.

19888051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11948.

The product of its (nonzero) digits is 23040, while the sum is 40.

The square root of 19888051 is about 4459.6021122966. The cubic root of 19888051 is about 270.9343531844.

The spelling of 19888051 in words is "nineteen million, eight hundred eighty-eight thousand, fifty-one".