20137445648 has 10 divisors (see below), whose sum is σ = 39016300974. Its totient is φ = 10068722816.

The previous prime is 20137445639. The next prime is 20137445687. The reversal of 20137445648 is 84654473102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17305928704 + 2831516944 = 131552^2 + 53212^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20137445599 and 20137445608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629295161 + ... + 629295192.

Almost surely, 2^20137445648 is an apocalyptic number.

It is an amenable number.

20137445648 is a deficient number, since it is larger than the sum of its proper divisors (18878855326).

20137445648 is a wasteful number, since it uses less digits than its factorization.

20137445648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258590361 (or 1258590355 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 44.

The spelling of 20137445648 in words is "twenty billion, one hundred thirty-seven million, four hundred forty-five thousand, six hundred forty-eight".