20215537378680 has 512 divisors, whose sum is σ = 72106848000000. Its totient is φ = 4532137139712.

The previous prime is 20215537378637. The next prime is 20215537378681. The reversal of 20215537378680 is 8687373551202.

It is a self number, because there is not a number n which added to its sum of digits gives 20215537378680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20215537378681) 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 127 ways as a sum of consecutive naturals, for example, 6127775671 + ... + 6127778969.

It is an arithmetic number, because the mean of its divisors is an integer number (140833687500).

Almost surely, 2^{20215537378680} is an apocalyptic number.

20215537378680 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 20215537378680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36053424000000).

20215537378680 is an abundant number, since it is smaller than the sum of its proper divisors (51891310621320).

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

20215537378680 is an frugal number, since it uses more digits than its factorization.

20215537378680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 20215537378680 in words is "twenty trillion, two hundred fifteen billion, five hundred thirty-seven million, three hundred seventy-eight thousand, six hundred eighty".