20022559 has 4 divisors (see below), whose sum is σ = 20668480. Its totient is φ = 19376640.

The previous prime is 20022553. The next prime is 20022571. The reversal of 20022559 is 95522002.

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 20022559 - 2¹³ = 20014367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022553) 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, 322914 + ... + 322975.

It is an arithmetic number, because the mean of its divisors is an integer number (5167120).

Almost surely, 2^20022559 is an apocalyptic number.

20022559 is a deficient number, since it is larger than the sum of its proper divisors (645921).

20022559 is an equidigital number, since it uses as much as digits as its factorization.

20022559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645920.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20022559 is about 4474.6574170544. The cubic root of 20022559 is about 271.5437808899.

The spelling of 20022559 in words is "twenty million, twenty-two thousand, five hundred fifty-nine".