20858255040 has 224 divisors, whose sum is σ = 76753419264. Its totient is φ = 4700344320.

The previous prime is 20858255003. The next prime is 20858255053. The reversal of 20858255040 is 4055285802.

It is a tau number, because it is divible by the number of its divisors (224).

It is a self number, because there is not a number n which added to its sum of digits gives 20858255040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 455262 + ... + 498978.

Almost surely, 2^20858255040 is an apocalyptic number.

20858255040 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 20858255040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38376709632).

20858255040 is an abundant number, since it is smaller than the sum of its proper divisors (55895164224).

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

20858255040 is a wasteful number, since it uses less digits than its factorization.

20858255040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43815 (or 43805 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 39.

The spelling of 20858255040 in words is "twenty billion, eight hundred fifty-eight million, two hundred fifty-five thousand, forty".