20220091 has 4 divisors (see below), whose sum is σ = 20872384. Its totient is φ = 19567800.

The previous prime is 20220077. The next prime is 20220103. The reversal of 20220091 is 19002202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19002202 = 2 ⋅9501101.

It is a cyclic number.

It is not a de Polignac number, because 20220091 - 2¹³ = 20211899 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20220041) 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, 326100 + ... + 326161.

It is an arithmetic number, because the mean of its divisors is an integer number (5218096).

Almost surely, 2^20220091 is an apocalyptic number.

20220091 is a deficient number, since it is larger than the sum of its proper divisors (652293).

20220091 is an equidigital number, since it uses as much as digits as its factorization.

20220091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652292.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20220091 is about 4496.6755497812. The cubic root of 20220091 is about 272.4338295692.

Adding to 20220091 its reverse (19002202), we get a palindrome (39222293).

The spelling of 20220091 in words is "twenty million, two hundred twenty thousand, ninety-one".