20001550400 has 84 divisors (see below), whose sum is σ = 53002240452. Its totient is φ = 7385180160.

The previous prime is 20001550333. The next prime is 20001550403. The reversal of 20001550400 is 405510002.

It can be written as a sum of positive squares in 6 ways, for example, as 95726656 + 19905823744 = 9784^2 + 141088^2 .

It is not an unprimeable number, because it can be changed into a prime (20001550403) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 460007 + ... + 501606.

It is an arithmetic number, because the mean of its divisors is an integer number (630979053).

Almost surely, 2^20001550400 is an apocalyptic number.

20001550400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001550400 is an abundant number, since it is smaller than the sum of its proper divisors (33000690052).

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

20001550400 is a wasteful number, since it uses less digits than its factorization.

20001550400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961648 (or 961633 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The spelling of 20001550400 in words is "twenty billion, one million, five hundred fifty thousand, four hundred".