20502047277 has 48 divisors (see below), whose sum is σ = 31646160000. Its totient is φ = 12745423872.

The previous prime is 20502047273. The next prime is 20502047323. The reversal of 20502047277 is 77274020502.

It is not a de Polignac number, because 20502047277 - 2² = 20502047273 is a prime.

It is a super-2 number, since 2×20502047277² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20502047273) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19543849 + ... + 19544897.

It is an arithmetic number, because the mean of its divisors is an integer number (659295000).

Almost surely, 2^20502047277 is an apocalyptic number.

It is an amenable number.

20502047277 is a deficient number, since it is larger than the sum of its proper divisors (11144112723).

20502047277 is a wasteful number, since it uses less digits than its factorization.

20502047277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 54880, while the sum is 36.

Adding to 20502047277 its reverse (77274020502), we get a palindrome (97776067779).

The spelling of 20502047277 in words is "twenty billion, five hundred two million, forty-seven thousand, two hundred seventy-seven".