20630559 has 4 divisors (see below), whose sum is σ = 27507416. Its totient is φ = 13753704.

The previous prime is 20630557. The next prime is 20630567. The reversal of 20630559 is 95503602.

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

It is not a de Polignac number, because 20630559 - 2¹ = 20630557 is a prime.

It is a super-3 number, since 3×20630559³ (a number of 23 digits) contains 333 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 (20630551) 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, 3438424 + ... + 3438429.

It is an arithmetic number, because the mean of its divisors is an integer number (6876854).

Almost surely, 2^20630559 is an apocalyptic number.

20630559 is a deficient number, since it is larger than the sum of its proper divisors (6876857).

20630559 is an equidigital number, since it uses as much as digits as its factorization.

20630559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876856.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 20630559 is about 4542.0875156694. The cubic root of 20630559 is about 274.2649638242.

The spelling of 20630559 in words is "twenty million, six hundred thirty thousand, five hundred fifty-nine".