20256203520 has 1152 divisors, whose sum is σ = 88285102080. Its totient is φ = 4299816960.

The previous prime is 20256203519. The next prime is 20256203531. The reversal of 20256203520 is 2530265202.

20256203520 is a `hidden beast` number, since 2 + 0 + 2 + 5 + 620 + 35 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 277482204 + ... + 277482276.

Almost surely, 2^20256203520 is an apocalyptic number.

20256203520 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 20256203520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44142551040).

20256203520 is an abundant number, since it is smaller than the sum of its proper divisors (68028898560).

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

20256203520 is a wasteful number, since it uses less digits than its factorization.

20256203520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 20256203520 its reverse (2530265202), we get a palindrome (22786468722).

The spelling of 20256203520 in words is "twenty billion, two hundred fifty-six million, two hundred three thousand, five hundred twenty".