20100172884 has 96 divisors (see below), whose sum is σ = 53945256960. Its totient is φ = 5760921600.

The previous prime is 20100172867. The next prime is 20100172907. The reversal of 20100172884 is 48827100102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1601377 + ... + 1613879.

It is an arithmetic number, because the mean of its divisors is an integer number (561929760).

Almost surely, 2^20100172884 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 20100172884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26972628480).

20100172884 is an abundant number, since it is smaller than the sum of its proper divisors (33845084076).

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

20100172884 is a wasteful number, since it uses less digits than its factorization.

20100172884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13181 (or 13179 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 33.

Adding to 20100172884 its reverse (48827100102), we get a palindrome (68927272986).

The spelling of 20100172884 in words is "twenty billion, one hundred million, one hundred seventy-two thousand, eight hundred eighty-four".