20064882640 has 40 divisors (see below), whose sum is σ = 50891840928. Its totient is φ = 7296320640.

The previous prime is 20064882583. The next prime is 20064882641. The reversal of 20064882640 is 4628846002.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20064882593 and 20064882602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20064882641) 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, 11399622 + ... + 11401381.

Almost surely, 2^20064882640 is an apocalyptic number.

20064882640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20064882640 is an abundant number, since it is smaller than the sum of its proper divisors (30826958288).

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

20064882640 is a wasteful number, since it uses less digits than its factorization.

20064882640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22801027 (or 22801021 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 20064882640 in words is "twenty billion, sixty-four million, eight hundred eighty-two thousand, six hundred forty".