20942792569 has 4 divisors (see below), whose sum is σ = 21664957860. Its totient is φ = 20220627280.

The previous prime is 20942792527. The next prime is 20942792593. The reversal of 20942792569 is 96529724902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9372563344 + 11570229225 = 96812^2 + 107565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20942792569 - 2¹⁷ = 20942661497 is a prime.

It is a super-2 number, since 2×20942792569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20942792069) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 361082602 + ... + 361082659.

It is an arithmetic number, because the mean of its divisors is an integer number (5416239465).

Almost surely, 2^20942792569 is an apocalyptic number.

20942792569 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20942792569 is a deficient number, since it is larger than the sum of its proper divisors (722165291).

20942792569 is an equidigital number, since it uses as much as digits as its factorization.

20942792569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722165290.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 20942792569 in words is "twenty billion, nine hundred forty-two million, seven hundred ninety-two thousand, five hundred sixty-nine".