20893429680 has 40 divisors (see below), whose sum is σ = 64769632752. Its totient is φ = 5571581184.

The previous prime is 20893429673. The next prime is 20893429681. The reversal of 20893429680 is 8692439802.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20893429681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43527739 + ... + 43528218.

Almost surely, 2^20893429680 is an apocalyptic number.

20893429680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20893429680 is an abundant number, since it is smaller than the sum of its proper divisors (43876203072).

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

20893429680 is a wasteful number, since it uses less digits than its factorization.

20893429680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87055973 (or 87055967 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 20893429680 in words is "twenty billion, eight hundred ninety-three million, four hundred twenty-nine thousand, six hundred eighty".