20339989496640 has 1792 divisors, whose sum is σ = 84650323968000. Its totient is φ = 4605731020800.

The previous prime is 20339989496621. The next prime is 20339989496653. The reversal of 20339989496640 is 4669498993302.

20339989496640 is a `hidden beast` number, since 2 + 0 + 3 + 3 + 9 + 98 + 9 + 496 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 6920716291 + ... + 6920719229.

It is an arithmetic number, because the mean of its divisors is an integer number (47237904000).

Almost surely, 2^{20339989496640} is an apocalyptic number.

20339989496640 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 20339989496640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42325161984000).

20339989496640 is an abundant number, since it is smaller than the sum of its proper divisors (64310334471360).

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

20339989496640 is a wasteful number, since it uses less digits than its factorization.

20339989496640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048 (or 3020 counting only the distinct ones).

The product of its (nonzero) digits is 544195584, while the sum is 72.

The spelling of 20339989496640 in words is "twenty trillion, three hundred thirty-nine billion, nine hundred eighty-nine million, four hundred ninety-six thousand, six hundred forty".