20540091 has 48 divisors (see below), whose sum is σ = 33730560. Its totient is φ = 11007360.

The previous prime is 20540059. The next prime is 20540099. The reversal of 20540091 is 19004502.

It is not a de Polignac number, because 20540091 - 2⁵ = 20540059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540099) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161670 + ... + 161796.

It is an arithmetic number, because the mean of its divisors is an integer number (702720).

Almost surely, 2^20540091 is an apocalyptic number.

20540091 is a deficient number, since it is larger than the sum of its proper divisors (13190469).

20540091 is a wasteful number, since it uses less digits than its factorization.

20540091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20540091 is about 4532.1177169178. The cubic root of 20540091 is about 273.8634791507.

Adding to 20540091 its reverse (19004502), we get a palindrome (39544593).

The spelling of 20540091 in words is "twenty million, five hundred forty thousand, ninety-one".