20478608 has 20 divisors (see below), whose sum is σ = 42011820. Its totient is φ = 9636864.

The previous prime is 20478607. The next prime is 20478613. The reversal of 20478608 is 80687402.

It can be written as a sum of positive squares in 2 ways, for example, as 10942864 + 9535744 = 3308^2 + 3088^2 .

It is not an unprimeable number, because it can be changed into a prime (20478607) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 37373 + ... + 37916.

It is an arithmetic number, because the mean of its divisors is an integer number (2100591).

Almost surely, 2^20478608 is an apocalyptic number.

It is an amenable number.

20478608 is an abundant number, since it is smaller than the sum of its proper divisors (21533212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20478608 is a wasteful number, since it uses less digits than its factorization.

20478608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75314 (or 75308 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 20478608 is about 4525.3296012556. The cubic root of 20478608 is about 273.5899526650.

The spelling of 20478608 in words is "twenty million, four hundred seventy-eight thousand, six hundred eight".