20565151920 has 240 divisors, whose sum is σ = 72201093120. Its totient is φ = 5235884544.

The previous prime is 20565151913. The next prime is 20565151939. The reversal of 20565151920 is 2915156502.

20565151920 is a `hidden beast` number, since 2 + 0 + 56 + 515 + 1 + 92 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14290561 + ... + 14291999.

It is an arithmetic number, because the mean of its divisors is an integer number (300837888).

Almost surely, 2^20565151920 is an apocalyptic number.

20565151920 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 20565151920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36100546560).

20565151920 is an abundant number, since it is smaller than the sum of its proper divisors (51635941200).

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

20565151920 is a wasteful number, since it uses less digits than its factorization.

20565151920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2335 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 20565151920 in words is "twenty billion, five hundred sixty-five million, one hundred fifty-one thousand, nine hundred twenty".