20387151 has 6 divisors (see below), whose sum is σ = 29448120. Its totient is φ = 13591428.

The previous prime is 20387123. The next prime is 20387167. The reversal of 20387151 is 15178302.

It is not a de Polignac number, because 20387151 - 2⁷ = 20387023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1132611 + ... + 1132628.

It is an arithmetic number, because the mean of its divisors is an integer number (4908020).

Almost surely, 2^20387151 is an apocalyptic number.

20387151 is a deficient number, since it is larger than the sum of its proper divisors (9060969).

20387151 is a wasteful number, since it uses less digits than its factorization.

20387151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265245 (or 2265242 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 20387151 is about 4515.2132839989. The cubic root of 20387151 is about 273.1820626723.

The spelling of 20387151 in words is "twenty million, three hundred eighty-seven thousand, one hundred fifty-one".