20718058 has 4 divisors (see below), whose sum is σ = 31077090. Its totient is φ = 10359028.

The previous prime is 20718031. The next prime is 20718073. The reversal of 20718058 is 85081702.

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., 20675209 + 42849 = 4547^2 + 207^2 .

It is a super-3 number, since 3×20718058³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5179513 + ... + 5179516.

Almost surely, 2^20718058 is an apocalyptic number.

20718058 is a deficient number, since it is larger than the sum of its proper divisors (10359032).

20718058 is a wasteful number, since it uses less digits than its factorization.

20718058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359031.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 20718058 is about 4551.7093492445. The cubic root of 20718058 is about 274.6521574509.

The spelling of 20718058 in words is "twenty million, seven hundred eighteen thousand, fifty-eight".