20005533544 has 8 divisors (see below), whose sum is σ = 37510375410. Its totient is φ = 10002766768.

The previous prime is 20005533539. The next prime is 20005533593. The reversal of 20005533544 is 44533550002.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18136008900 + 1869524644 = 134670^2 + 43238^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250345839 + ... + 1250345854.

Almost surely, 2^20005533544 is an apocalyptic number.

It is an amenable number.

20005533544 is a deficient number, since it is larger than the sum of its proper divisors (17504841866).

20005533544 is a wasteful number, since it uses less digits than its factorization.

20005533544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500691699 (or 2500691695 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 31.

The spelling of 20005533544 in words is "twenty billion, five million, five hundred thirty-three thousand, five hundred forty-four".