20791187 has 16 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 18207360.

The previous prime is 20791181. The next prime is 20791189. The reversal of 20791187 is 78119702.

It is a cyclic number.

It is not a de Polignac number, because 20791187 - 2¹⁰ = 20790163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20791181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18512 + ... + 19602.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^20791187 is an apocalyptic number.

20791187 is a deficient number, since it is larger than the sum of its proper divisors (2796013).

20791187 is a wasteful number, since it uses less digits than its factorization.

20791187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 20791187 is about 4559.7354089903. The cubic root of 20791187 is about 274.9749266396.

The spelling of 20791187 in words is "twenty million, seven hundred ninety-one thousand, one hundred eighty-seven".