20422559 has 4 divisors (see below), whose sum is σ = 21623904. Its totient is φ = 19221216.

The previous prime is 20422517. The next prime is 20422579. The reversal of 20422559 is 95522402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20422559 is a prime.

It is a super-2 number, since 2×20422559² = 834161832216962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422579) 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, 600647 + ... + 600680.

It is an arithmetic number, because the mean of its divisors is an integer number (5405976).

Almost surely, 2^20422559 is an apocalyptic number.

20422559 is a deficient number, since it is larger than the sum of its proper divisors (1201345).

20422559 is a wasteful number, since it uses less digits than its factorization.

20422559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201344.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 20422559 is about 4519.1325495055. The cubic root of 20422559 is about 273.3401236002.

The spelling of 20422559 in words is "twenty million, four hundred twenty-two thousand, five hundred fifty-nine".