20710304640 has 128 divisors (see below), whose sum is σ = 73349056800. Its totient is φ = 5522743296.

The previous prime is 20710304599. The next prime is 20710304647. The reversal of 20710304640 is 4640301702.

20710304640 is a `hidden beast` number, since 2 + 0 + 7 + 10 + 3 + 0 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20710304647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581977 + ... + 616536.

Almost surely, 2^20710304640 is an apocalyptic number.

20710304640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20710304640 is an abundant number, since it is smaller than the sum of its proper divisors (52638752160).

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

20710304640 is a wasteful number, since it uses less digits than its factorization.

20710304640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198541 (or 1198523 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The spelling of 20710304640 in words is "twenty billion, seven hundred ten million, three hundred four thousand, six hundred forty".