20500002540 has 36 divisors (see below), whose sum is σ = 62183341584. Its totient is φ = 5466667296.

The previous prime is 20500002527. The next prime is 20500002673. The reversal of 20500002540 is 4520000502.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 56944272 + ... + 56944631.

It is an arithmetic number, because the mean of its divisors is an integer number (1727315044).

Almost surely, 2^20500002540 is an apocalyptic number.

20500002540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20500002540 is an abundant number, since it is smaller than the sum of its proper divisors (41683339044).

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

20500002540 is a wasteful number, since it uses less digits than its factorization.

20500002540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113888918 (or 113888913 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The spelling of 20500002540 in words is "twenty billion, five hundred million, two thousand, five hundred forty".