20630539 has 4 divisors (see below), whose sum is σ = 20819920. Its totient is φ = 20441160.

The previous prime is 20630507. The next prime is 20630543. The reversal of 20630539 is 93503602.

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 20630539 - 2⁵ = 20630507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20630569) 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, 94527 + ... + 94744.

It is an arithmetic number, because the mean of its divisors is an integer number (5204980).

Almost surely, 2^20630539 is an apocalyptic number.

20630539 is a deficient number, since it is larger than the sum of its proper divisors (189381).

20630539 is a wasteful number, since it uses less digits than its factorization.

20630539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189380.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 20630539 is about 4542.0853140380. The cubic root of 20630539 is about 274.2648751968.

The spelling of 20630539 in words is "twenty million, six hundred thirty thousand, five hundred thirty-nine".