20006653 has 4 divisors (see below), whose sum is σ = 20471968. Its totient is φ = 19541340.

The previous prime is 20006641. The next prime is 20006663. The reversal of 20006653 is 35660002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20006653 - 2⁵ = 20006621 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 (20006663) 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, 232593 + ... + 232678.

It is an arithmetic number, because the mean of its divisors is an integer number (5117992).

Almost surely, 2^20006653 is an apocalyptic number.

It is an amenable number.

20006653 is a deficient number, since it is larger than the sum of its proper divisors (465315).

20006653 is an equidigital number, since it uses as much as digits as its factorization.

20006653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465314.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20006653 is about 4472.8797211640. The cubic root of 20006653 is about 271.4718566900.

Adding to 20006653 its reverse (35660002), we get a palindrome (55666655).

The spelling of 20006653 in words is "twenty million, six thousand, six hundred fifty-three".