20545551604 has 12 divisors (see below), whose sum is σ = 35959340704. Its totient is φ = 10271454264.

The previous prime is 20545551571. The next prime is 20545551629. The reversal of 20545551604 is 40615554502.

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 3 ways as a sum of consecutive naturals, for example, 294984 + ... + 357919.

Almost surely, 2^20545551604 is an apocalyptic number.

It is an amenable number.

20545551604 is a deficient number, since it is larger than the sum of its proper divisors (15413789100).

20545551604 is a wasteful number, since it uses less digits than its factorization.

20545551604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660774 (or 660772 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 20545551604 in words is "twenty billion, five hundred forty-five million, five hundred fifty-one thousand, six hundred four".