20879594037990 has 96 divisors (see below), whose sum is σ = 56173795423200. Its totient is φ = 5374470366720.

The previous prime is 20879594037979. The next prime is 20879594037997. The reversal of 20879594037990 is 9973049597802.

20879594037990 is a `hidden beast` number, since 2 + 0 + 87 + 9 + 5 + 94 + 0 + 379 + 90 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879594037997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8804730 + ... + 10921650.

It is an arithmetic number, because the mean of its divisors is an integer number (585143702325).

Almost surely, 2^{20879594037990} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20879594037990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28086897711600).

20879594037990 is an abundant number, since it is smaller than the sum of its proper divisors (35294201385210).

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

20879594037990 is a wasteful number, since it uses less digits than its factorization.

20879594037990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120742 (or 2120739 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 72.

The spelling of 20879594037990 in words is "twenty trillion, eight hundred seventy-nine billion, five hundred ninety-four million, thirty-seven thousand, nine hundred ninety".