20515556150 has 24 divisors (see below), whose sum is σ = 38216725104. Its totient is φ = 8193794400.

The previous prime is 20515556119. The next prime is 20515556189. The reversal of 20515556150 is 5165551502.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20515556150.

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, 277322 + ... + 343421.

It is an arithmetic number, because the mean of its divisors is an integer number (1592363546).

Almost surely, 2^20515556150 is an apocalyptic number.

20515556150 is a deficient number, since it is larger than the sum of its proper divisors (17701168954).

20515556150 is a wasteful number, since it uses less digits than its factorization.

20515556150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621416 (or 621411 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 35.

The spelling of 20515556150 in words is "twenty billion, five hundred fifteen million, five hundred fifty-six thousand, one hundred fifty".