20022691 has 4 divisors (see below), whose sum is σ = 21562912. Its totient is φ = 18482472.

The previous prime is 20022689. The next prime is 20022707. The reversal of 20022691 is 19622002.

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: 19622002 = 2 ⋅9811001.

It is a cyclic number.

It is not a de Polignac number, because 20022691 - 2¹ = 20022689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20022631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770091 + ... + 770116.

It is an arithmetic number, because the mean of its divisors is an integer number (5390728).

Almost surely, 2^20022691 is an apocalyptic number.

20022691 is a deficient number, since it is larger than the sum of its proper divisors (1540221).

20022691 is a wasteful number, since it uses less digits than its factorization.

20022691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540220.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20022691 is about 4474.6721667626. The cubic root of 20022691 is about 271.5443776119.

Adding to 20022691 its reverse (19622002), we get a palindrome (39644693).

Subtracting from 20022691 its reverse (19622002), we obtain a square (400689 = 633²).

The spelling of 20022691 in words is "twenty million, twenty-two thousand, six hundred ninety-one".