20542618 has 4 divisors (see below), whose sum is σ = 30813930. Its totient is φ = 10271308.

The previous prime is 20542603. The next prime is 20542633. The reversal of 20542618 is 81624502.

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

It is an interprime number because it is at equal distance from previous prime (20542603) and next prime (20542633).

It can be written as a sum of positive squares in only one way, i.e., 10975969 + 9566649 = 3313^2 + 3093^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5135653 + ... + 5135656.

Almost surely, 2^20542618 is an apocalyptic number.

20542618 is a deficient number, since it is larger than the sum of its proper divisors (10271312).

20542618 is a wasteful number, since it uses less digits than its factorization.

20542618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271311.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20542618 is about 4532.3964963361. The cubic root of 20542618 is about 273.8747096208.

The spelling of 20542618 in words is "twenty million, five hundred forty-two thousand, six hundred eighteen".