20858872990258 has 4 divisors (see below), whose sum is σ = 31288309485390. Its totient is φ = 10429436495128.

The previous prime is 20858872990223. The next prime is 20858872990259. The reversal of 20858872990258 is 85209927885802.

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

It can be written as a sum of positive squares in only one way, i.e., 18047942434369 + 2810930555889 = 4248287^2 + 1676583^2 .

It is not an unprimeable number, because it can be changed into a prime (20858872990259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5214718247563 + ... + 5214718247566.

Almost surely, 2^{20858872990258} is an apocalyptic number.

20858872990258 is a deficient number, since it is larger than the sum of its proper divisors (10429436495132).

20858872990258 is a wasteful number, since it uses less digits than its factorization.

20858872990258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10429436495131.

The product of its (nonzero) digits is 464486400, while the sum is 73.

The spelling of 20858872990258 in words is "twenty trillion, eight hundred fifty-eight billion, eight hundred seventy-two million, nine hundred ninety thousand, two hundred fifty-eight".