20317761277 has 4 divisors (see below), whose sum is σ = 22164830496. Its totient is φ = 18470692060.

The previous prime is 20317761227. The next prime is 20317761287. The reversal of 20317761277 is 77216771302.

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 a de Polignac number, because none of the positive numbers 2^k-20317761277 is a prime.

It is a super-2 number, since 2×20317761277² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317761227) 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, 923534593 + ... + 923534614.

It is an arithmetic number, because the mean of its divisors is an integer number (5541207624).

Almost surely, 2^20317761277 is an apocalyptic number.

It is an amenable number.

20317761277 is a deficient number, since it is larger than the sum of its proper divisors (1847069219).

20317761277 is a wasteful number, since it uses less digits than its factorization.

20317761277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847069218.

The product of its (nonzero) digits is 172872, while the sum is 43.

The spelling of 20317761277 in words is "twenty billion, three hundred seventeen million, seven hundred sixty-one thousand, two hundred seventy-seven".