20529617639 has 8 divisors (see below), whose sum is σ = 22105671120. Its totient is φ = 18994500736.

The previous prime is 20529617609. The next prime is 20529617657. The reversal of 20529617639 is 93671692502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20529617639 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 (20529617609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10233104 + ... + 10235109.

It is an arithmetic number, because the mean of its divisors is an integer number (2763208890).

Almost surely, 2^20529617639 is an apocalyptic number.

20529617639 is a deficient number, since it is larger than the sum of its proper divisors (1576053481).

20529617639 is a wasteful number, since it uses less digits than its factorization.

20529617639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20468289.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 20529617639 in words is "twenty billion, five hundred twenty-nine million, six hundred seventeen thousand, six hundred thirty-nine".