20632705 has 8 divisors (see below), whose sum is σ = 24784704. Its totient is φ = 16489200.

The previous prime is 20632693. The next prime is 20632709. The reversal of 20632705 is 50723602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-20632705 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20632705.

It is not an unprimeable number, because it can be changed into a prime (20632709) 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 7 ways as a sum of consecutive naturals, for example, 6190 + ... + 8920.

It is an arithmetic number, because the mean of its divisors is an integer number (3098088).

Almost surely, 2^20632705 is an apocalyptic number.

It is an amenable number.

20632705 is a deficient number, since it is larger than the sum of its proper divisors (4151999).

20632705 is a wasteful number, since it uses less digits than its factorization.

20632705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20632705 is about 4542.3237445167. The cubic root of 20632705 is about 274.2744732160.

The spelling of 20632705 in words is "twenty million, six hundred thirty-two thousand, seven hundred five".