20655857250 has 512 divisors, whose sum is σ = 69440716800. Its totient is φ = 4442169600.

The previous prime is 20655857237. The next prime is 20655857251. The reversal of 20655857250 is 5275855602.

20655857250 is a `hidden beast` number, since 2 + 0 + 65 + 585 + 7 + 2 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 20655857196 and 20655857205.

It is not an unprimeable number, because it can be changed into a prime (20655857251) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 90200136 + ... + 90200364.

It is an arithmetic number, because the mean of its divisors is an integer number (135626400).

Almost surely, 2^20655857250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20655857250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34720358400).

20655857250 is an abundant number, since it is smaller than the sum of its proper divisors (48784859550).

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

20655857250 is a wasteful number, since it uses less digits than its factorization.

20655857250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 20655857250 in words is "twenty billion, six hundred fifty-five million, eight hundred fifty-seven thousand, two hundred fifty".