20000206651 has 4 divisors (see below), whose sum is σ = 20002792752. Its totient is φ = 19997620552.

The previous prime is 20000206637. The next prime is 20000206687. The reversal of 20000206651 is 15660200002.

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 20000206651 - 2¹⁹ = 19999682363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000200651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1281415 + ... + 1296928.

It is an arithmetic number, because the mean of its divisors is an integer number (5000698188).

Almost surely, 2^20000206651 is an apocalyptic number.

20000206651 is a deficient number, since it is larger than the sum of its proper divisors (2586101).

20000206651 is an equidigital number, since it uses as much as digits as its factorization.

20000206651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586100.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20000206651 its reverse (15660200002), we get a palindrome (35660406653).

The spelling of 20000206651 in words is "twenty billion, two hundred six thousand, six hundred fifty-one".