20178807672 has 32 divisors (see below), whose sum is σ = 52640369280. Its totient is φ = 6433822560.

The previous prime is 20178807667. The next prime is 20178807703. The reversal of 20178807672 is 27670887102.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18277354 + ... + 18278457.

It is an arithmetic number, because the mean of its divisors is an integer number (1645011540).

Almost surely, 2^20178807672 is an apocalyptic number.

It is an amenable number.

20178807672 is an abundant number, since it is smaller than the sum of its proper divisors (32461561608).

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

20178807672 is a wasteful number, since it uses less digits than its factorization.

20178807672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36555843 (or 36555839 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 48.

The spelling of 20178807672 in words is "twenty billion, one hundred seventy-eight million, eight hundred seven thousand, six hundred seventy-two".