20878953984 has 800 divisors, whose sum is σ = 77002928640. Its totient is φ = 5503500288.

The previous prime is 20878953983. The next prime is 20878954009. The reversal of 20878953984 is 48935987802.

20878953984 is a `hidden beast` number, since 20 + 8 + 78 + 9 + 539 + 8 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878953983) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 353880547 + ... + 353880605.

Almost surely, 2^20878953984 is an apocalyptic number.

20878953984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20878953984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38501464320).

20878953984 is an abundant number, since it is smaller than the sum of its proper divisors (56123974656).

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

20878953984 is an equidigital number, since it uses as much as digits as its factorization.

20878953984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 63.

The spelling of 20878953984 in words is "twenty billion, eight hundred seventy-eight million, nine hundred fifty-three thousand, nine hundred eighty-four".