20263645121 has 4 divisors (see below), whose sum is σ = 20288693700. Its totient is φ = 20238596544.

The previous prime is 20263645117. The next prime is 20263645139. The reversal of 20263645121 is 12154636202.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14481715600 + 5781929521 = 120340^2 + 76039^2 .

It is a cyclic number.

It is not a de Polignac number, because 20263645121 - 2² = 20263645117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20263645111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12523076 + ... + 12524693.

It is an arithmetic number, because the mean of its divisors is an integer number (5072173425).

Almost surely, 2^20263645121 is an apocalyptic number.

It is an amenable number.

20263645121 is a deficient number, since it is larger than the sum of its proper divisors (25048579).

20263645121 is an equidigital number, since it uses as much as digits as its factorization.

20263645121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25048578.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 20263645121 in words is "twenty billion, two hundred sixty-three million, six hundred forty-five thousand, one hundred twenty-one".