20913831936 has 420 divisors, whose sum is σ = 67044427632. Its totient is φ = 6497501184.

The previous prime is 20913831881. The next prime is 20913832001. The reversal of 20913831936 is 63913831902.

It is a junction number, because it is equal to n+sod(n) for n = 20913831891 and 20913831900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 203046861 + ... + 203046963.

Almost surely, 2^20913831936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20913831936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33522213816).

20913831936 is an abundant number, since it is smaller than the sum of its proper divisors (46130595696).

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

20913831936 is an frugal number, since it uses more digits than its factorization.

20913831936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 20913831936 in words is "twenty billion, nine hundred thirteen million, eight hundred thirty-one thousand, nine hundred thirty-six".