20696477791968 has 216 divisors, whose sum is σ = 64913354231544. Its totient is φ = 6250251870720.

The previous prime is 20696477791949. The next prime is 20696477791973. The reversal of 20696477791968 is 86919777469602.

20696477791968 is a `hidden beast` number, since 2 + 0 + 6 + 9 + 6 + 477 + 79 + 19 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9196971 + ... + 11223957.

It is an arithmetic number, because the mean of its divisors is an integer number (300524788109).

Almost surely, 2^{20696477791968} 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 20696477791968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32456677115772).

20696477791968 is an abundant number, since it is smaller than the sum of its proper divisors (44216876439576).

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

20696477791968 is a wasteful number, since it uses less digits than its factorization.

20696477791968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027318 (or 2027296 counting only the distinct ones).

The product of its (nonzero) digits is 3456649728, while the sum is 81.

The spelling of 20696477791968 in words is "twenty trillion, six hundred ninety-six billion, four hundred seventy-seven million, seven hundred ninety-one thousand, nine hundred sixty-eight".