20770457 has 2 divisors, whose sum is σ = 20770458. Its totient is φ = 20770456.

The previous prime is 20770429. The next prime is 20770459. The reversal of 20770457 is 75407702.

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., 18011536 + 2758921 = 4244^2 + 1661^2 .

It is a cyclic number.

It is not a de Polignac number, because 20770457 - 2¹⁶ = 20704921 is a prime.

Together with 20770459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20770459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385228 + 10385229.

It is an arithmetic number, because the mean of its divisors is an integer number (10385229).

Almost surely, 2^20770457 is an apocalyptic number.

It is an amenable number.

20770457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20770457 is an equidigital number, since it uses as much as digits as its factorization.

20770457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 20770457 is about 4557.4616838762. The cubic root of 20770457 is about 274.8835076846.

The spelling of 20770457 in words is "twenty million, seven hundred seventy thousand, four hundred fifty-seven".