20345357 has 2 divisors, whose sum is σ = 20345358. Its totient is φ = 20345356.

The previous prime is 20345293. The next prime is 20345359. The reversal of 20345357 is 75354302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 729316 = 4429^2 + 854^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345357 - 2⁶ = 20345293 is a prime.

Together with 20345359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172678 + 10172679.

It is an arithmetic number, because the mean of its divisors is an integer number (10172679).

Almost surely, 2^20345357 is an apocalyptic number.

It is an amenable number.

20345357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345357 is an equidigital number, since it uses as much as digits as its factorization.

20345357 is an evil number, because the sum of its binary digits is even.

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

The square root of 20345357 is about 4510.5827783115. The cubic root of 20345357 is about 272.9952590338.

Adding to 20345357 its reverse (75354302), we get a palindrome (95699659).

It can be divided in two parts, 20345 and 357, that added together give a palindrome (20702).

The spelling of 20345357 in words is "twenty million, three hundred forty-five thousand, three hundred fifty-seven".