20529169679 has 4 divisors (see below), whose sum is σ = 20536898784. Its totient is φ = 20521440576.

The previous prime is 20529169657. The next prime is 20529169691. The reversal of 20529169679 is 97696192502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97696192502 = 2 ⋅48848096251.

It is a cyclic number.

It is not a de Polignac number, because 20529169679 - 2¹⁶ = 20529104143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20529169699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3860567 + ... + 3865880.

It is an arithmetic number, because the mean of its divisors is an integer number (5134224696).

Almost surely, 2^20529169679 is an apocalyptic number.

20529169679 is a deficient number, since it is larger than the sum of its proper divisors (7729105).

20529169679 is an equidigital number, since it uses as much as digits as its factorization.

20529169679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729104.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 20529169679 in words is "twenty billion, five hundred twenty-nine million, one hundred sixty-nine thousand, six hundred seventy-nine".