20420978632 has 16 divisors (see below), whose sum is σ = 38336676300. Its totient is φ = 10197864960.

The previous prime is 20420978563. The next prime is 20420978639. The reversal of 20420978632 is 23687902402.

It can be written as a sum of positive squares in 2 ways, for example, as 19484251396 + 936727236 = 139586^2 + 30606^2 .

It is not an unprimeable number, because it can be changed into a prime (20420978639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1571169 + ... + 1584112.

Almost surely, 2^20420978632 is an apocalyptic number.

It is an amenable number.

20420978632 is a deficient number, since it is larger than the sum of its proper divisors (17915697668).

20420978632 is a wasteful number, since it uses less digits than its factorization.

20420978632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3156096 (or 3156092 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 20420978632 in words is "twenty billion, four hundred twenty million, nine hundred seventy-eight thousand, six hundred thirty-two".