20239389 has 20 divisors (see below), whose sum is σ = 31827840. Its totient is φ = 12781800.

The previous prime is 20239381. The next prime is 20239399. The reversal of 20239389 is 98393202.

It is not a de Polignac number, because 20239389 - 2³ = 20239381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20239381) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5037 + ... + 8114.

It is an arithmetic number, because the mean of its divisors is an integer number (1591392).

Almost surely, 2^20239389 is an apocalyptic number.

It is an amenable number.

20239389 is a deficient number, since it is larger than the sum of its proper divisors (11588451).

20239389 is a wasteful number, since it uses less digits than its factorization.

20239389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13182 (or 13173 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20239389 is about 4498.8208455105. The cubic root of 20239389 is about 272.5204720472.

The spelling of 20239389 in words is "twenty million, two hundred thirty-nine thousand, three hundred eighty-nine".