20772901 has 2 divisors, whose sum is σ = 20772902. Its totient is φ = 20772900.

The previous prime is 20772877. The next prime is 20772911. The reversal of 20772901 is 10927702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19448100 + 1324801 = 4410^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20772901 - 2²¹ = 18675749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20772901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20772911) 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 as a sum of consecutive naturals, namely, 10386450 + 10386451.

It is an arithmetic number, because the mean of its divisors is an integer number (10386451).

Almost surely, 2^20772901 is an apocalyptic number.

It is an amenable number.

20772901 is a deficient number, since it is larger than the sum of its proper divisors (1).

20772901 is an equidigital number, since it uses as much as digits as its factorization.

20772901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20772901 is about 4557.7298077003. The cubic root of 20772901 is about 274.8942888460.

The spelling of 20772901 in words is "twenty million, seven hundred seventy-two thousand, nine hundred one".