20551485312 has 48 divisors (see below), whose sum is σ = 59139043080. Its totient is φ = 6850494720.

The previous prime is 20551485289. The next prime is 20551485319. The reversal of 20551485312 is 21358415502.

20551485312 is a `hidden beast` number, since 2 + 0 + 551 + 48 + 53 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551485319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8918764 + ... + 8921067.

Almost surely, 2^20551485312 is an apocalyptic number.

It is an amenable number.

20551485312 is an abundant number, since it is smaller than the sum of its proper divisors (38587557768).

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

20551485312 is a wasteful number, since it uses less digits than its factorization.

20551485312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17839851 (or 17839836 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 20551485312 in words is "twenty billion, five hundred fifty-one million, four hundred eighty-five thousand, three hundred twelve".