20187291 has 8 divisors (see below), whose sum is σ = 28333120. Its totient is φ = 12749832.

The previous prime is 20187289. The next prime is 20187317. The reversal of 20187291 is 19278102.

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

It is not a de Polignac number, because 20187291 - 2¹ = 20187289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20187281) 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, 177025 + ... + 177138.

It is an arithmetic number, because the mean of its divisors is an integer number (3541640).

Almost surely, 2^20187291 is an apocalyptic number.

20187291 is a deficient number, since it is larger than the sum of its proper divisors (8145829).

20187291 is a wasteful number, since it uses less digits than its factorization.

20187291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354185.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20187291 is about 4493.0269307005. The cubic root of 20187291 is about 272.2864404251.

The spelling of 20187291 in words is "twenty million, one hundred eighty-seven thousand, two hundred ninety-one".