20194019 has 4 divisors (see below), whose sum is σ = 20209320. Its totient is φ = 20178720.

The previous prime is 20193991. The next prime is 20194037. The reversal of 20194019 is 91049102.

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

It is a cyclic number.

It is not a de Polignac number, because 20194019 - 2⁸ = 20193763 is a prime.

It is a super-2 number, since 2×20194019² = 815596806744722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20194039) 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, 5462 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (5052330).

Almost surely, 2^20194019 is an apocalyptic number.

20194019 is a deficient number, since it is larger than the sum of its proper divisors (15301).

20194019 is a wasteful number, since it uses less digits than its factorization.

20194019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15300.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20194019 is about 4493.7755840718. The cubic root of 20194019 is about 272.3166861821.

The spelling of 20194019 in words is "twenty million, one hundred ninety-four thousand, nineteen".