20499893568 has 252 divisors, whose sum is σ = 73815021280. Its totient is φ = 5324520960.

The previous prime is 20499893563. The next prime is 20499893593. The reversal of 20499893568 is 86539899402.

20499893568 is a `hidden beast` number, since 2 + 0 + 499 + 8 + 93 + 56 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (252).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20499893563) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 466863 + ... + 508881.

Almost surely, 2^20499893568 is an apocalyptic number.

20499893568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20499893568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36907510640).

20499893568 is an abundant number, since it is smaller than the sum of its proper divisors (53315127712).

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

20499893568 is a wasteful number, since it uses less digits than its factorization.

20499893568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42066 (or 42042 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 20499893568 in words is "twenty billion, four hundred ninety-nine million, eight hundred ninety-three thousand, five hundred sixty-eight".