20789585129 has 4 divisors (see below), whose sum is σ = 21883773840. Its totient is φ = 19695396420.

The previous prime is 20789585111. The next prime is 20789585137. The reversal of 20789585129 is 92158598702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20789585129 - 2¹⁶ = 20789519593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20789585629) 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, 547094327 + ... + 547094364.

It is an arithmetic number, because the mean of its divisors is an integer number (5470943460).

Almost surely, 2^20789585129 is an apocalyptic number.

It is an amenable number.

20789585129 is a deficient number, since it is larger than the sum of its proper divisors (1094188711).

20789585129 is a wasteful number, since it uses less digits than its factorization.

20789585129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094188710.

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 20789585129 in words is "twenty billion, seven hundred eighty-nine million, five hundred eighty-five thousand, one hundred twenty-nine".