20011500640 has 48 divisors (see below), whose sum is σ = 47319694128. Its totient is φ = 7997400576.

The previous prime is 20011500629. The next prime is 20011500661. The reversal of 20011500640 is 4600511002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123994 + ... + 235366.

It is an arithmetic number, because the mean of its divisors is an integer number (985826961).

Almost surely, 2^20011500640 is an apocalyptic number.

20011500640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011500640 is an abundant number, since it is smaller than the sum of its proper divisors (27308193488).

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

20011500640 is a wasteful number, since it uses less digits than its factorization.

20011500640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112511 (or 112503 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 20011500640 in words is "twenty billion, eleven million, five hundred thousand, six hundred forty".