20355988968 has 96 divisors (see below), whose sum is σ = 64709573760. Its totient is φ = 5658802560.

The previous prime is 20355988967. The next prime is 20355988973. The reversal of 20355988968 is 86988955302.

20355988968 is a `hidden beast` number, since 2 + 0 + 35 + 598 + 8 + 9 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (20355988963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527148 + ... + 564443.

It is an arithmetic number, because the mean of its divisors is an integer number (674058060).

Almost surely, 2^20355988968 is an apocalyptic number.

20355988968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20355988968 is an abundant number, since it is smaller than the sum of its proper divisors (44353584792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20355988968 is a wasteful number, since it uses less digits than its factorization.

20355988968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091647 (or 1091640 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 20355988968 in words is "twenty billion, three hundred fifty-five million, nine hundred eighty-eight thousand, nine hundred sixty-eight".