20420104253 has 2 divisors, whose sum is σ = 20420104254. Its totient is φ = 20420104252.

The previous prime is 20420104249. The next prime is 20420104267. The reversal of 20420104253 is 35240102402.

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., 12413970724 + 8006133529 = 111418^2 + 89477^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420104253 - 2² = 20420104249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420104273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210052126 + 10210052127.

It is an arithmetic number, because the mean of its divisors is an integer number (10210052127).

Almost surely, 2^20420104253 is an apocalyptic number.

It is an amenable number.

20420104253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420104253 is an equidigital number, since it uses as much as digits as its factorization.

20420104253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 20420104253 its reverse (35240102402), we get a palindrome (55660206655).

The spelling of 20420104253 in words is "twenty billion, four hundred twenty million, one hundred four thousand, two hundred fifty-three".