20542730769 has 12 divisors (see below), whose sum is σ = 32370363792. Its totient is φ = 12450139800.

The previous prime is 20542730717. The next prime is 20542730777. The reversal of 20542730769 is 96703724502.

20542730769 is a `hidden beast` number, since 2 + 0 + 542 + 7 + 30 + 76 + 9 = 666.

It is not a de Polignac number, because 20542730769 - 2²³ = 20534342161 is a prime.

It is a super-2 number, since 2×20542730769² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20542730869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103751067 + ... + 103751264.

It is an arithmetic number, because the mean of its divisors is an integer number (2697530316).

Almost surely, 2^20542730769 is an apocalyptic number.

It is an amenable number.

20542730769 is a deficient number, since it is larger than the sum of its proper divisors (11827633023).

20542730769 is a wasteful number, since it uses less digits than its factorization.

20542730769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207502348 (or 207502345 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

It can be divided in two parts, 205427 and 30769, that added together give a square (236196 = 486²).

The spelling of 20542730769 in words is "twenty billion, five hundred forty-two million, seven hundred thirty thousand, seven hundred sixty-nine".