20420293 has 2 divisors, whose sum is σ = 20420294. Its totient is φ = 20420292.

The previous prime is 20420287. The next prime is 20420303. The reversal of 20420293 is 39202402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11068929 + 9351364 = 3327^2 + 3058^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420293 - 2⁹ = 20419781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210146 + 10210147.

It is an arithmetic number, because the mean of its divisors is an integer number (10210147).

Almost surely, 2^20420293 is an apocalyptic number.

It is an amenable number.

20420293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420293 is an equidigital number, since it uses as much as digits as its factorization.

20420293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20420293 is about 4518.8818307187. The cubic root of 20420293 is about 273.3300136751.

Adding to 20420293 its reverse (39202402), we get a palindrome (59622695).

The spelling of 20420293 in words is "twenty million, four hundred twenty thousand, two hundred ninety-three".