19972886 has 4 divisors (see below), whose sum is σ = 29959332. Its totient is φ = 9986442.

The previous prime is 19972861. The next prime is 19972889. The reversal of 19972886 is 68827991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993220 + ... + 4993223.

It is an arithmetic number, because the mean of its divisors is an integer number (7489833).

Almost surely, 2^19972886 is an apocalyptic number.

19972886 is a deficient number, since it is larger than the sum of its proper divisors (9986446).

19972886 is an equidigital number, since it uses as much as digits as its factorization.

19972886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986445.

The product of its digits is 435456, while the sum is 50.

The square root of 19972886 is about 4469.1034895155. The cubic root of 19972886 is about 271.3190416535.

The spelling of 19972886 in words is "nineteen million, nine hundred seventy-two thousand, eight hundred eighty-six".