20999484240 has 160 divisors (see below), whose sum is σ = 75618183936. Its totient is φ = 4721172480.

The previous prime is 20999484223. The next prime is 20999484241. The reversal of 20999484240 is 4248499902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999484241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24 + ... + 204936.

Almost surely, 2^20999484240 is an apocalyptic number.

20999484240 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 20999484240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37809091968).

20999484240 is an abundant number, since it is smaller than the sum of its proper divisors (54618699696).

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

20999484240 is a wasteful number, since it uses less digits than its factorization.

20999484240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204997 (or 204991 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 20999484240 in words is "twenty billion, nine hundred ninety-nine million, four hundred eighty-four thousand, two hundred forty".