20072155317 has 4 divisors (see below), whose sum is σ = 26762873760. Its totient is φ = 13381436876.

The previous prime is 20072155277. The next prime is 20072155321. The reversal of 20072155317 is 71355127002.

It is a happy number.

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 20072155317 - 2⁶ = 20072155253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20072155387) 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, 3345359217 + ... + 3345359222.

It is an arithmetic number, because the mean of its divisors is an integer number (6690718440).

Almost surely, 2^20072155317 is an apocalyptic number.

It is an amenable number.

20072155317 is a deficient number, since it is larger than the sum of its proper divisors (6690718443).

20072155317 is an equidigital number, since it uses as much as digits as its factorization.

20072155317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690718442.

The product of its (nonzero) digits is 14700, while the sum is 33.

The spelling of 20072155317 in words is "twenty billion, seventy-two million, one hundred fifty-five thousand, three hundred seventeen".