20992530689 has 8 divisors (see below), whose sum is σ = 22608709032. Its totient is φ = 19376547840.

The previous prime is 20992530653. The next prime is 20992530697. The reversal of 20992530689 is 98603529902.

It can be written as a sum of positive squares in 4 ways, for example, as 1506604225 + 19485926464 = 38815^2 + 139592^2 .

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

It is not a de Polignac number, because 20992530689 - 2²⁴ = 20975753473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20992530689.

It is not an unprimeable number, because it can be changed into a prime (20992533689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235457 + ... + 312129.

It is an arithmetic number, because the mean of its divisors is an integer number (2826088629).

Almost surely, 2^20992530689 is an apocalyptic number.

It is an amenable number.

20992530689 is a deficient number, since it is larger than the sum of its proper divisors (1616178343).

20992530689 is a wasteful number, since it uses less digits than its factorization.

20992530689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97747.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 20992530689 in words is "twenty billion, nine hundred ninety-two million, five hundred thirty thousand, six hundred eighty-nine".