20387071 has 2 divisors, whose sum is σ = 20387072. Its totient is φ = 20387070.

The previous prime is 20387069. The next prime is 20387083. The reversal of 20387071 is 17078302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20387071 - 2¹ = 20387069 is a prime.

Together with 20387069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20387051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193535 + 10193536.

It is an arithmetic number, because the mean of its divisors is an integer number (10193536).

Almost surely, 2^20387071 is an apocalyptic number.

20387071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387071 is an equidigital number, since it uses as much as digits as its factorization.

20387071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20387071 is about 4515.2044250510. The cubic root of 20387071 is about 273.1817053461.

The spelling of 20387071 in words is "twenty million, three hundred eighty-seven thousand, seventy-one".