20450155317 has 4 divisors (see below), whose sum is σ = 27266873760. Its totient is φ = 13633436876.

The previous prime is 20450155309. The next prime is 20450155367. The reversal of 20450155317 is 71355105402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20450155317 - 2³ = 20450155309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450155367) 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, 3408359217 + ... + 3408359222.

It is an arithmetic number, because the mean of its divisors is an integer number (6816718440).

Almost surely, 2^20450155317 is an apocalyptic number.

It is an amenable number.

20450155317 is a deficient number, since it is larger than the sum of its proper divisors (6816718443).

20450155317 is an equidigital number, since it uses as much as digits as its factorization.

20450155317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816718442.

The product of its (nonzero) digits is 21000, while the sum is 33.

The spelling of 20450155317 in words is "twenty billion, four hundred fifty million, one hundred fifty-five thousand, three hundred seventeen".