20194387 has 2 divisors, whose sum is σ = 20194388. Its totient is φ = 20194386.

The previous prime is 20194381. The next prime is 20194399. The reversal of 20194387 is 78349102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20194387 - 2⁷ = 20194259 is a prime.

It is not a weakly prime, because it can be changed into another prime (20194381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097193 + 10097194.

It is an arithmetic number, because the mean of its divisors is an integer number (10097194).

Almost surely, 2^20194387 is an apocalyptic number.

20194387 is a deficient number, since it is larger than the sum of its proper divisors (1).

20194387 is an equidigital number, since it uses as much as digits as its factorization.

20194387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20194387 is about 4493.8165294102. The cubic root of 20194387 is about 272.3183403341.

The spelling of 20194387 in words is "twenty million, one hundred ninety-four thousand, three hundred eighty-seven".