20118458 has 4 divisors (see below), whose sum is σ = 30177690. Its totient is φ = 10059228.

The previous prime is 20118437. The next prime is 20118467. The reversal of 20118458 is 85481102.

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., 16265089 + 3853369 = 4033^2 + 1963^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20118458.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5029613 + ... + 5029616.

Almost surely, 2^20118458 is an apocalyptic number.

20118458 is a deficient number, since it is larger than the sum of its proper divisors (10059232).

20118458 is a wasteful number, since it uses less digits than its factorization.

20118458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10059231.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 20118458 is about 4485.3604091533. The cubic root of 20118458 is about 271.9766145552.

The spelling of 20118458 in words is "twenty million, one hundred eighteen thousand, four hundred fifty-eight".