20999286720 has 224 divisors, whose sum is σ = 78439060800. Its totient is φ = 5270372352.

The previous prime is 20999286719. The next prime is 20999286727. The reversal of 20999286720 is 2768299902.

It is a happy number.

20999286720 is a `hidden beast` number, since 209 + 99 + 286 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999286727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75396 + ... + 218364.

Almost surely, 2^20999286720 is an apocalyptic number.

20999286720 is a gapful number since it is divisible by the number (20) 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 20999286720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39219530400).

20999286720 is an abundant number, since it is smaller than the sum of its proper divisors (57439774080).

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

20999286720 is a wasteful number, since it uses less digits than its factorization.

20999286720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143012 (or 142996 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 20999286720 in words is "twenty billion, nine hundred ninety-nine million, two hundred eighty-six thousand, seven hundred twenty".