20478532 has 6 divisors (see below), whose sum is σ = 35837438. Its totient is φ = 10239264.

The previous prime is 20478509. The next prime is 20478539. The reversal of 20478532 is 23587402.

It can be written as a sum of positive squares in only one way, i.e., 12559936 + 7918596 = 3544^2 + 2814^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20478494 and 20478503.

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 as a sum of consecutive naturals, namely, 2559813 + ... + 2559820.

Almost surely, 2^20478532 is an apocalyptic number.

It is an amenable number.

20478532 is a deficient number, since it is larger than the sum of its proper divisors (15358906).

20478532 is a wasteful number, since it uses less digits than its factorization.

20478532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5119637 (or 5119635 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20478532 is about 4525.3212040694. The cubic root of 20478532 is about 273.5896142165.

The spelling of 20478532 in words is "twenty million, four hundred seventy-eight thousand, five hundred thirty-two".