20845113120 has 144 divisors (see below), whose sum is σ = 76605859512. Its totient is φ = 5131100160.

The previous prime is 20845113077. The next prime is 20845113127. The reversal of 20845113120 is 2131154802.

20845113120 is a `hidden beast` number, since 20 + 8 + 4 + 511 + 3 + 120 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7692693264 + 13152419856 = 87708^2 + 114684^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×20845113120² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20845113127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538041 + ... + 575480.

Almost surely, 2^20845113120 is an apocalyptic number.

20845113120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20845113120 is an abundant number, since it is smaller than the sum of its proper divisors (55760746392).

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

20845113120 is a wasteful number, since it uses less digits than its factorization.

20845113120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113555 (or 1113544 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 20845113120 its reverse (2131154802), we get a palindrome (22976267922).

The spelling of 20845113120 in words is "twenty billion, eight hundred forty-five million, one hundred thirteen thousand, one hundred twenty".