20340651 has 4 divisors (see below), whose sum is σ = 27120872. Its totient is φ = 13560432.

The previous prime is 20340643. The next prime is 20340679. The reversal of 20340651 is 15604302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20340651 - 2³ = 20340643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20340601) 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, 3390106 + ... + 3390111.

It is an arithmetic number, because the mean of its divisors is an integer number (6780218).

Almost surely, 2^20340651 is an apocalyptic number.

20340651 is a deficient number, since it is larger than the sum of its proper divisors (6780221).

20340651 is an equidigital number, since it uses as much as digits as its factorization.

20340651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780220.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20340651 is about 4510.0610860608. The cubic root of 20340651 is about 272.9742089443.

Adding to 20340651 its reverse (15604302), we get a palindrome (35944953).

The spelling of 20340651 in words is "twenty million, three hundred forty thousand, six hundred fifty-one".