20484578 has 4 divisors (see below), whose sum is σ = 30726870. Its totient is φ = 10242288.

The previous prime is 20484547. The next prime is 20484599. The reversal of 20484578 is 87548402.

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., 17197609 + 3286969 = 4147^2 + 1813^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5121143 + ... + 5121146.

Almost surely, 2^20484578 is an apocalyptic number.

20484578 is a deficient number, since it is larger than the sum of its proper divisors (10242292).

20484578 is a wasteful number, since it uses less digits than its factorization.

20484578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10242291.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 20484578 is about 4525.9891736503. The cubic root of 20484578 is about 273.6165360689.

The spelling of 20484578 in words is "twenty million, four hundred eighty-four thousand, five hundred seventy-eight".