20354091 has 4 divisors (see below), whose sum is σ = 27138792. Its totient is φ = 13569392.

The previous prime is 20354071. The next prime is 20354099. The reversal of 20354091 is 19045302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20354091 - 2¹⁸ = 20091947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20354099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3392346 + ... + 3392351.

It is an arithmetic number, because the mean of its divisors is an integer number (6784698).

Almost surely, 2^20354091 is an apocalyptic number.

20354091 is a deficient number, since it is larger than the sum of its proper divisors (6784701).

20354091 is an equidigital number, since it uses as much as digits as its factorization.

20354091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784700.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 20354091 is about 4511.5508420054. The cubic root of 20354091 is about 273.0343178960.

Adding to 20354091 its reverse (19045302), we get a palindrome (39399393).

The spelling of 20354091 in words is "twenty million, three hundred fifty-four thousand, ninety-one".