20938879890 has 192 divisors, whose sum is σ = 59913584640. Its totient is φ = 5246700480.

The previous prime is 20938879861. The next prime is 20938879921. The reversal of 20938879890 is 9897883902.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5861805 + ... + 5865375.

It is an arithmetic number, because the mean of its divisors is an integer number (312049920).

Almost surely, 2^20938879890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20938879890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29956792320).

20938879890 is an abundant number, since it is smaller than the sum of its proper divisors (38974704750).

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

20938879890 is a wasteful number, since it uses less digits than its factorization.

20938879890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739 (or 3727 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 20938879890 in words is "twenty billion, nine hundred thirty-eight million, eight hundred seventy-nine thousand, eight hundred ninety".