20478530 has 16 divisors (see below), whose sum is σ = 37381824. Its totient is φ = 8075760.

The previous prime is 20478509. The next prime is 20478539. The reversal of 20478530 is 3587402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20478493 and 20478502.

It is not an unprimeable number, because it can be changed into a prime (20478539) 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 7 ways as a sum of consecutive naturals, for example, 13712 + ... + 15131.

It is an arithmetic number, because the mean of its divisors is an integer number (2336364).

Almost surely, 2^20478530 is an apocalyptic number.

20478530 is a deficient number, since it is larger than the sum of its proper divisors (16903294).

20478530 is a wasteful number, since it uses less digits than its factorization.

20478530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28921.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20478530 is about 4525.3209830906. The cubic root of 20478530 is about 273.5896053100.

The spelling of 20478530 in words is "twenty million, four hundred seventy-eight thousand, five hundred thirty".