20380457 has 2 divisors, whose sum is σ = 20380458. Its totient is φ = 20380456.

The previous prime is 20380453. The next prime is 20380471. The reversal of 20380457 is 75408302.

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., 10621081 + 9759376 = 3259^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380457 - 2² = 20380453 is a prime.

It is not a weakly prime, because it can be changed into another prime (20380453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190228 + 10190229.

It is an arithmetic number, because the mean of its divisors is an integer number (10190229).

Almost surely, 2^20380457 is an apocalyptic number.

It is an amenable number.

20380457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380457 is an equidigital number, since it uses as much as digits as its factorization.

20380457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20380457 is about 4514.4719514025. The cubic root of 20380457 is about 273.1521601632.

Adding to 20380457 its reverse (75408302), we get a palindrome (95788759).

The spelling of 20380457 in words is "twenty million, three hundred eighty thousand, four hundred fifty-seven".