20836457 has 2 divisors, whose sum is σ = 20836458. Its totient is φ = 20836456.

The previous prime is 20836447. The next prime is 20836477. The reversal of 20836457 is 75463802.

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., 13808656 + 7027801 = 3716^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 20836457 - 2⁸ = 20836201 is a prime.

It is not a weakly prime, because it can be changed into another prime (20836427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10418228 + 10418229.

It is an arithmetic number, because the mean of its divisors is an integer number (10418229).

Almost surely, 2^20836457 is an apocalyptic number.

It is an amenable number.

20836457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20836457 is an equidigital number, since it uses as much as digits as its factorization.

20836457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 20836457 is about 4564.6968135901. The cubic root of 20836457 is about 275.1743555474.

The spelling of 20836457 in words is "twenty million, eight hundred thirty-six thousand, four hundred fifty-seven".