20831318420 has 192 divisors, whose sum is σ = 51446707200. Its totient is φ = 7005450240.

The previous prime is 20831318419. The next prime is 20831318437. The reversal of 20831318420 is 2481313802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33652871 + ... + 33653489.

It is an arithmetic number, because the mean of its divisors is an integer number (267951600).

Almost surely, 2^20831318420 is an apocalyptic number.

20831318420 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 20831318420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25723353600).

20831318420 is an abundant number, since it is smaller than the sum of its proper divisors (30615388780).

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

20831318420 is a wasteful number, since it uses less digits than its factorization.

20831318420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The spelling of 20831318420 in words is "twenty billion, eight hundred thirty-one million, three hundred eighteen thousand, four hundred twenty".