20387113 has 2 divisors, whose sum is σ = 20387114. Its totient is φ = 20387112.

The previous prime is 20387089. The next prime is 20387123. The reversal of 20387113 is 31178302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18939904 + 1447209 = 4352^2 + 1203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20387113 - 2²¹ = 18289961 is a prime.

It is not a weakly prime, because it can be changed into another prime (20387123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193556 + 10193557.

It is an arithmetic number, because the mean of its divisors is an integer number (10193557).

Almost surely, 2^20387113 is an apocalyptic number.

It is an amenable number.

20387113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387113 is an equidigital number, since it uses as much as digits as its factorization.

20387113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20387113 is about 4515.2090760008. The cubic root of 20387113 is about 273.1818929425.

It can be divided in two parts, 20387 and 113, that multiplied together give a triangular number (2303731 = T₂₁₄₆).

The spelling of 20387113 in words is "twenty million, three hundred eighty-seven thousand, one hundred thirteen".