20768953 has 2 divisors, whose sum is σ = 20768954. Its totient is φ = 20768952.

The previous prime is 20768947. The next prime is 20768981. The reversal of 20768953 is 35986702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 2704 = 4557^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 20768953 - 2²¹ = 18671801 is a prime.

It is not a weakly prime, because it can be changed into another prime (20768353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10384476 + 10384477.

It is an arithmetic number, because the mean of its divisors is an integer number (10384477).

Almost surely, 2^20768953 is an apocalyptic number.

It is an amenable number.

20768953 is a deficient number, since it is larger than the sum of its proper divisors (1).

20768953 is an equidigital number, since it uses as much as digits as its factorization.

20768953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20768953 is about 4557.2966767592. The cubic root of 20768953 is about 274.8768727034.

The spelling of 20768953 in words is "twenty million, seven hundred sixty-eight thousand, nine hundred fifty-three".