20045651 has 2 divisors, whose sum is σ = 20045652. Its totient is φ = 20045650.

The previous prime is 20045629. The next prime is 20045681. The reversal of 20045651 is 15654002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20045651 - 2¹⁰ = 20044627 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20045621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022825 + 10022826.

It is an arithmetic number, because the mean of its divisors is an integer number (10022826).

Almost surely, 2^20045651 is an apocalyptic number.

20045651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045651 is an equidigital number, since it uses as much as digits as its factorization.

20045651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20045651 is about 4477.2369827830. The cubic root of 20045651 is about 271.6481311871.

Adding to 20045651 its reverse (15654002), we get a palindrome (35699653).

The spelling of 20045651 in words is "twenty million, forty-five thousand, six hundred fifty-one".