20238591 has 8 divisors (see below), whose sum is σ = 28405120. Its totient is φ = 12782232.

The previous prime is 20238587. The next prime is 20238601. The reversal of 20238591 is 19583202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20238591 - 2² = 20238587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20238541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177475 + ... + 177588.

It is an arithmetic number, because the mean of its divisors is an integer number (3550640).

Almost surely, 2^20238591 is an apocalyptic number.

20238591 is a deficient number, since it is larger than the sum of its proper divisors (8166529).

20238591 is a wasteful number, since it uses less digits than its factorization.

20238591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355085.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20238591 is about 4498.7321547298. The cubic root of 20238591 is about 272.5168903483.

The spelling of 20238591 in words is "twenty million, two hundred thirty-eight thousand, five hundred ninety-one".