20854051540 has 96 divisors (see below), whose sum is σ = 54383616000. Its totient is φ = 6555116160.

The previous prime is 20854051529. The next prime is 20854051553. The reversal of 20854051540 is 4515045802.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20854051496 and 20854051505.

It is a congruent number.

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, 43990 + ... + 208909.

It is an arithmetic number, because the mean of its divisors is an integer number (566496000).

Almost surely, 2^20854051540 is an apocalyptic number.

20854051540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20854051540 is an abundant number, since it is smaller than the sum of its proper divisors (33529564460).

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

20854051540 is a wasteful number, since it uses less digits than its factorization.

20854051540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252965 (or 252963 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 20854051540 in words is "twenty billion, eight hundred fifty-four million, fifty-one thousand, five hundred forty".