20990337064380 has 144 divisors (see below), whose sum is σ = 65322864603360. Its totient is φ = 5453856178176.

The previous prime is 20990337064369. The next prime is 20990337064387. The reversal of 20990337064380 is 8346073309902.

20990337064380 is a `hidden beast` number, since 20 + 9 + 90 + 33 + 70 + 6 + 438 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20990337064387) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7545477 + ... + 9945596.

It is an arithmetic number, because the mean of its divisors is an integer number (453631004190).

Almost surely, 2^{20990337064380} is an apocalyptic number.

20990337064380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20990337064380 is an abundant number, since it is smaller than the sum of its proper divisors (44332527538980).

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

20990337064380 is a wasteful number, since it uses less digits than its factorization.

20990337064380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17491260 (or 17491255 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 54.

The spelling of 20990337064380 in words is "twenty trillion, nine hundred ninety billion, three hundred thirty-seven million, sixty-four thousand, three hundred eighty".