20972801 has 2 divisors, whose sum is σ = 20972802. Its totient is φ = 20972800.

The previous prime is 20972797. The next prime is 20972813. The reversal of 20972801 is 10827902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 361201 = 4540^2 + 601^2 .

It is a cyclic number.

It is not a de Polignac number, because 20972801 - 2² = 20972797 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20972851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10486400 + 10486401.

It is an arithmetic number, because the mean of its divisors is an integer number (10486401).

Almost surely, 2^20972801 is an apocalyptic number.

It is an amenable number.

20972801 is a deficient number, since it is larger than the sum of its proper divisors (1).

20972801 is an equidigital number, since it uses as much as digits as its factorization.

20972801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20972801 is about 4579.6070792154. The cubic root of 20972801 is about 275.7732551000.

The spelling of 20972801 in words is "twenty million, nine hundred seventy-two thousand, eight hundred one".