20671872804 has 288 divisors, whose sum is σ = 60025405440. Its totient is φ = 5993507520.

The previous prime is 20671872799. The next prime is 20671872841. The reversal of 20671872804 is 40827817602.

It is a self number, because there is not a number n which added to its sum of digits gives 20671872804.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 162770589 + ... + 162770715.

Almost surely, 2^20671872804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671872804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30012702720).

20671872804 is an abundant number, since it is smaller than the sum of its proper divisors (39353532636).

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

20671872804 is a wasteful number, since it uses less digits than its factorization.

20671872804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 20671872804 in words is "twenty billion, six hundred seventy-one million, eight hundred seventy-two thousand, eight hundred four".