20518730258 has 8 divisors (see below), whose sum is σ = 33145641228. Its totient is φ = 9470183184.

The previous prime is 20518730257. The next prime is 20518730269. The reversal of 20518730258 is 85203781502.

It can be written as a sum of positive squares in 2 ways, for example, as 20379561049 + 139169209 = 142757^2 + 11797^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20518730257) 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, 394590941 + ... + 394590992.

Almost surely, 2^20518730258 is an apocalyptic number.

20518730258 is a deficient number, since it is larger than the sum of its proper divisors (12626910970).

20518730258 is a wasteful number, since it uses less digits than its factorization.

20518730258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789181948.

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 20518730258 in words is "twenty billion, five hundred eighteen million, seven hundred thirty thousand, two hundred fifty-eight".