20770973 has 2 divisors, whose sum is σ = 20770974. Its totient is φ = 20770972.

The previous prime is 20770963. The next prime is 20771029. The reversal of 20770973 is 37907702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11303044 + 9467929 = 3362^2 + 3077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20770973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20770903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385486 + 10385487.

It is an arithmetic number, because the mean of its divisors is an integer number (10385487).

Almost surely, 2^20770973 is an apocalyptic number.

It is an amenable number.

20770973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770973 is an equidigital number, since it uses as much as digits as its factorization.

20770973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18522, while the sum is 35.

The square root of 20770973 is about 4557.5182939841. The cubic root of 20770973 is about 274.8857839741.

The spelling of 20770973 in words is "twenty million, seven hundred seventy thousand, nine hundred seventy-three".