20008651 has 4 divisors (see below), whose sum is σ = 21547792. Its totient is φ = 18469512.

The previous prime is 20008649. The next prime is 20008657. The reversal of 20008651 is 15680002.

It is a happy number.

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 20008651 - 2¹ = 20008649 is a prime.

It is a super-2 number, since 2×20008651² = 800692229679602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20008657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769551 + ... + 769576.

It is an arithmetic number, because the mean of its divisors is an integer number (5386948).

Almost surely, 2^20008651 is an apocalyptic number.

20008651 is a deficient number, since it is larger than the sum of its proper divisors (1539141).

20008651 is a wasteful number, since it uses less digits than its factorization.

20008651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539140.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20008651 is about 4473.1030616341. The cubic root of 20008651 is about 271.4808933959.

Adding to 20008651 its reverse (15680002), we get a palindrome (35688653).

The spelling of 20008651 in words is "twenty million, eight thousand, six hundred fifty-one".