20643482680 has 32 divisors (see below), whose sum is σ = 46454562000. Its totient is φ = 8256197376.

The previous prime is 20643482623. The next prime is 20643482711. The reversal of 20643482680 is 8628434602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274444 + ... + 341476.

Almost surely, 2^20643482680 is an apocalyptic number.

20643482680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20643482680 is an abundant number, since it is smaller than the sum of its proper divisors (25811079320).

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

20643482680 is a wasteful number, since it uses less digits than its factorization.

20643482680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74743 (or 74739 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

The spelling of 20643482680 in words is "twenty billion, six hundred forty-three million, four hundred eighty-two thousand, six hundred eighty".