20640084580 has 24 divisors (see below), whose sum is σ = 44742378240. Its totient is φ = 7989709920.

The previous prime is 20640084539. The next prime is 20640084583. The reversal of 20640084580 is 8548004602.

It is not an unprimeable number, because it can be changed into a prime (20640084583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16644610 + ... + 16645849.

It is an arithmetic number, because the mean of its divisors is an integer number (1864265760).

Almost surely, 2^20640084580 is an apocalyptic number.

20640084580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20640084580 is an abundant number, since it is smaller than the sum of its proper divisors (24102293660).

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

20640084580 is a wasteful number, since it uses less digits than its factorization.

20640084580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33290499 (or 33290497 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 37.

The spelling of 20640084580 in words is "twenty billion, six hundred forty million, eighty-four thousand, five hundred eighty".