20706720458 has 4 divisors (see below), whose sum is σ = 31060080690. Its totient is φ = 10353360228.

The previous prime is 20706720457. The next prime is 20706720497. The reversal of 20706720458 is 85402760702.

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., 18901575289 + 1805145169 = 137483^2 + 42487^2 .

It is not an unprimeable number, because it can be changed into a prime (20706720457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5176680113 + ... + 5176680116.

Almost surely, 2^20706720458 is an apocalyptic number.

20706720458 is a deficient number, since it is larger than the sum of its proper divisors (10353360232).

20706720458 is a wasteful number, since it uses less digits than its factorization.

20706720458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10353360231.

The product of its (nonzero) digits is 188160, while the sum is 41.

The spelling of 20706720458 in words is "twenty billion, seven hundred six million, seven hundred twenty thousand, four hundred fifty-eight".