20911774743 has 6 divisors (see below), whose sum is σ = 30205896864. Its totient is φ = 13941183156.

The previous prime is 20911774739. The next prime is 20911774757. The reversal of 20911774743 is 34747711902.

20911774743 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 177 + 474 + 3 = 666.

It is not a de Polignac number, because 20911774743 - 2² = 20911774739 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20911774733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1161765255 + ... + 1161765272.

It is an arithmetic number, because the mean of its divisors is an integer number (5034316144).

Almost surely, 2^20911774743 is an apocalyptic number.

20911774743 is a deficient number, since it is larger than the sum of its proper divisors (9294122121).

20911774743 is a wasteful number, since it uses less digits than its factorization.

20911774743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323530533 (or 2323530530 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The spelling of 20911774743 in words is "twenty billion, nine hundred eleven million, seven hundred seventy-four thousand, seven hundred forty-three".