20019967 has 8 divisors (see below), whose sum is σ = 21882960. Its totient is φ = 18164160.

The previous prime is 20019953. The next prime is 20019971. The reversal of 20019967 is 76991002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20019967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019907) 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 7 ways as a sum of consecutive naturals, for example, 5259 + ... + 8227.

It is an arithmetic number, because the mean of its divisors is an integer number (2735370).

Almost surely, 2^20019967 is an apocalyptic number.

20019967 is a deficient number, since it is larger than the sum of its proper divisors (1862993).

20019967 is a wasteful number, since it uses less digits than its factorization.

20019967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 20019967 is about 4474.3677765691. The cubic root of 20019967 is about 271.5320629097.

The spelling of 20019967 in words is "twenty million, nineteen thousand, nine hundred sixty-seven".