39920618920 has 192 divisors, whose sum is σ = 112417632000. Its totient is φ = 12490942464.

The previous prime is 39920618873. The next prime is 39920618929. The reversal of 39920618920 is 2981602993.

It is not an unprimeable number, because it can be changed into a prime (39920618929) 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 47 ways as a sum of consecutive naturals, for example, 4206741 + ... + 4216219.

It is an arithmetic number, because the mean of its divisors is an integer number (585508500).

Almost surely, 2^39920618920 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 39920618920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56208816000).

39920618920 is an abundant number, since it is smaller than the sum of its proper divisors (72497013080).

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

39920618920 is a wasteful number, since it uses less digits than its factorization.

39920618920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9612 (or 9595 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 39920618920 in words is "thirty-nine billion, nine hundred twenty million, six hundred eighteen thousand, nine hundred twenty".