20520402253235 has 4 divisors (see below), whose sum is σ = 24624482703888. Its totient is φ = 16416321802584.

The previous prime is 20520402253187. The next prime is 20520402253249. The reversal of 20520402253235 is 53235220402502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20520402253235 - 2⁸ = 20520402252979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20520402253195 and 20520402253204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2052040225319 + ... + 2052040225328.

It is an arithmetic number, because the mean of its divisors is an integer number (6156120675972).

Almost surely, 2^{20520402253235} is an apocalyptic number.

20520402253235 is a deficient number, since it is larger than the sum of its proper divisors (4104080450653).

20520402253235 is an equidigital number, since it uses as much as digits as its factorization.

20520402253235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104080450652.

The product of its (nonzero) digits is 144000, while the sum is 35.

Adding to 20520402253235 its reverse (53235220402502), we get a palindrome (73755622655737).

The spelling of 20520402253235 in words is "twenty trillion, five hundred twenty billion, four hundred two million, two hundred fifty-three thousand, two hundred thirty-five".