19950869 has 4 divisors (see below), whose sum is σ = 20638860. Its totient is φ = 19262880.

The previous prime is 19950857. The next prime is 19950871. The reversal of 19950869 is 96805991.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12687844 + 7263025 = 3562^2 + 2695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19950869 is a prime.

It is a super-2 number, since 2×19950869² = 796074347710322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19950569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343952 + ... + 344009.

It is an arithmetic number, because the mean of its divisors is an integer number (5159715).

Almost surely, 2^19950869 is an apocalyptic number.

It is an amenable number.

19950869 is a deficient number, since it is larger than the sum of its proper divisors (687991).

19950869 is an equidigital number, since it uses as much as digits as its factorization.

19950869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687990.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 19950869 is about 4466.6395645944. The cubic root of 19950869 is about 271.2193093183.

The spelling of 19950869 in words is "nineteen million, nine hundred fifty thousand, eight hundred sixty-nine".