20477771316 has 18 divisors (see below), whose sum is σ = 51763255362. Its totient is φ = 6825923760.

The previous prime is 20477771297. The next prime is 20477771351. The reversal of 20477771316 is 61317777402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19830272400 + 647498916 = 140820^2 + 25446^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284413455 + ... + 284413526.

It is an arithmetic number, because the mean of its divisors is an integer number (2875736409).

Almost surely, 2^20477771316 is an apocalyptic number.

It is an amenable number.

20477771316 is an abundant number, since it is smaller than the sum of its proper divisors (31285484046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20477771316 is a wasteful number, since it uses less digits than its factorization.

20477771316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568826991 (or 568826986 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 45.

The spelling of 20477771316 in words is "twenty billion, four hundred seventy-seven million, seven hundred seventy-one thousand, three hundred sixteen".