20551634404 has 24 divisors (see below), whose sum is σ = 41716754240. Its totient is φ = 8676382176.

The previous prime is 20551634371. The next prime is 20551634437. The reversal of 20551634404 is 40443615502.

It is an interprime number because it is at equal distance from previous prime (20551634371) and next prime (20551634437).

It is a self number, because there is not a number n which added to its sum of digits gives 20551634404.

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 7 ways as a sum of consecutive naturals, for example, 5475639 + ... + 5479390.

Almost surely, 2^20551634404 is an apocalyptic number.

It is an amenable number.

20551634404 is an abundant number, since it is smaller than the sum of its proper divisors (21165119836).

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

20551634404 is a wasteful number, since it uses less digits than its factorization.

20551634404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10955107 (or 10955105 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 20551634404 in words is "twenty billion, five hundred fifty-one million, six hundred thirty-four thousand, four hundred four".