20617529087 has 4 divisors (see below), whose sum is σ = 20806680840. Its totient is φ = 20428377336.

The previous prime is 20617529069. The next prime is 20617529089. The reversal of 20617529087 is 78092571602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78092571602 = 2 ⋅39046285801.

It is a cyclic number.

It is not a de Polignac number, because 20617529087 - 2¹⁴ = 20617512703 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 (20617529089) 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, 94575713 + ... + 94575930.

It is an arithmetic number, because the mean of its divisors is an integer number (5201670210).

Almost surely, 2^20617529087 is an apocalyptic number.

20617529087 is a deficient number, since it is larger than the sum of its proper divisors (189151753).

20617529087 is a wasteful number, since it uses less digits than its factorization.

20617529087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189151752.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 20617529087 in words is "twenty billion, six hundred seventeen million, five hundred twenty-nine thousand, eighty-seven".