20354357 has 2 divisors, whose sum is σ = 20354358. Its totient is φ = 20354356.

The previous prime is 20354311. The next prime is 20354363. The reversal of 20354357 is 75345302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 649636 = 4439^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354357 - 2⁸ = 20354101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177178 + 10177179.

It is an arithmetic number, because the mean of its divisors is an integer number (10177179).

Almost surely, 2^20354357 is an apocalyptic number.

It is an amenable number.

20354357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354357 is an equidigital number, since it uses as much as digits as its factorization.

20354357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 29.

The square root of 20354357 is about 4511.5803217941. The cubic root of 20354357 is about 273.0355072852.

Adding to 20354357 its reverse (75345302), we get a palindrome (95699659).

The spelling of 20354357 in words is "twenty million, three hundred fifty-four thousand, three hundred fifty-seven".