20520540540 has 96 divisors (see below), whose sum is σ = 67597104960. Its totient is φ = 5150251008.

The previous prime is 20520540473. The next prime is 20520540559. The reversal of 20520540540 is 4504502502.

20520540540 is a `hidden beast` number, since 20 + 52 + 0 + 54 + 0 + 540 = 666.

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

20520540540 is a modest number, since divided by 540540 gives 20520 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1108497 + ... + 1126856.

It is an arithmetic number, because the mean of its divisors is an integer number (704136510).

Almost surely, 2^20520540540 is an apocalyptic number.

20520540540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520540540 is an abundant number, since it is smaller than the sum of its proper divisors (47076564420).

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

20520540540 is a wasteful number, since it uses less digits than its factorization.

20520540540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235388 (or 2235380 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The spelling of 20520540540 in words is "twenty billion, five hundred twenty million, five hundred forty thousand, five hundred forty".