20520504540 has 36 divisors (see below), whose sum is σ = 62245530984. Its totient is φ = 5472134496.

The previous prime is 20520504539. The next prime is 20520504553. The reversal of 20520504540 is 4540502502.

20520504540 is a `hidden beast` number, since 2 + 0 + 5 + 205 + 0 + 454 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20520504540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57001222 + ... + 57001581.

Almost surely, 2^20520504540 is an apocalyptic number.

20520504540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520504540 is an abundant number, since it is smaller than the sum of its proper divisors (41725026444).

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

20520504540 is a wasteful number, since it uses less digits than its factorization.

20520504540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114002818 (or 114002813 counting only the distinct ones).

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

The spelling of 20520504540 in words is "twenty billion, five hundred twenty million, five hundred four thousand, five hundred forty".