20718536707 has 4 divisors (see below), whose sum is σ = 22602040056. Its totient is φ = 18835033360.

The previous prime is 20718536693. The next prime is 20718536717. The reversal of 20718536707 is 70763581702.

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

It is not a de Polignac number, because 20718536707 - 2²³ = 20710148099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20718536717) 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, 941751658 + ... + 941751679.

It is an arithmetic number, because the mean of its divisors is an integer number (5650510014).

Almost surely, 2^20718536707 is an apocalyptic number.

20718536707 is a deficient number, since it is larger than the sum of its proper divisors (1883503349).

20718536707 is a wasteful number, since it uses less digits than its factorization.

20718536707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883503348.

The product of its (nonzero) digits is 493920, while the sum is 46.

It can be divided in two parts, 2071 and 8536707, that added together give a triangular number (8538778 = T₄₁₃₂).

The spelling of 20718536707 in words is "twenty billion, seven hundred eighteen million, five hundred thirty-six thousand, seven hundred seven".