20250091 has 16 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 18799648.

The previous prime is 20250089. The next prime is 20250101. The reversal of 20250091 is 19005202.

It is a cyclic number.

It is not a de Polignac number, because 20250091 - 2¹ = 20250089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20250031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113040 + ... + 113218.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^20250091 is an apocalyptic number.

20250091 is a deficient number, since it is larger than the sum of its proper divisors (1522709).

20250091 is a wasteful number, since it uses less digits than its factorization.

20250091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20250091 is about 4500.0101110998. The cubic root of 20250091 is about 272.5684972155.

Adding to 20250091 its reverse (19005202), we get a palindrome (39255293).

The spelling of 20250091 in words is "twenty million, two hundred fifty thousand, ninety-one".