20578860640 has 192 divisors, whose sum is σ = 53343360000. Its totient is φ = 7456610304.

The previous prime is 20578860629. The next prime is 20578860647. The reversal of 20578860640 is 4606887502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578860647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34355061 + ... + 34355659.

It is an arithmetic number, because the mean of its divisors is an integer number (277830000).

Almost surely, 2^20578860640 is an apocalyptic number.

20578860640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20578860640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26671680000).

20578860640 is an abundant number, since it is smaller than the sum of its proper divisors (32764499360).

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

20578860640 is a wasteful number, since it uses less digits than its factorization.

20578860640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 20578860640 in words is "twenty billion, five hundred seventy-eight million, eight hundred sixty thousand, six hundred forty".