20355988648 has 16 divisors (see below), whose sum is σ = 39098393460. Its totient is φ = 9929750400.

The previous prime is 20355988643. The next prime is 20355988651. The reversal of 20355988648 is 84688955302.

It can be written as a sum of positive squares in 2 ways, for example, as 12413970724 + 7942017924 = 111418^2 + 89118^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20355988592 and 20355988601.

It is not an unprimeable number, because it can be changed into a prime (20355988643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31030143 + ... + 31030798.

Almost surely, 2^20355988648 is an apocalyptic number.

It is an amenable number.

20355988648 is a deficient number, since it is larger than the sum of its proper divisors (18742404812).

20355988648 is a wasteful number, since it uses less digits than its factorization.

20355988648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62060988 (or 62060984 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 58.

The spelling of 20355988648 in words is "twenty billion, three hundred fifty-five million, nine hundred eighty-eight thousand, six hundred forty-eight".