20841579220 has 48 divisors (see below), whose sum is σ = 54567047808. Its totient is φ = 6496076160.

The previous prime is 20841579203. The next prime is 20841579271. The reversal of 20841579220 is 2297514802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6765207 + ... + 6768286.

It is an arithmetic number, because the mean of its divisors is an integer number (1136813496).

Almost surely, 2^20841579220 is an apocalyptic number.

20841579220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20841579220 is an abundant number, since it is smaller than the sum of its proper divisors (33725468588).

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

20841579220 is a wasteful number, since it uses less digits than its factorization.

20841579220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13533520 (or 13533518 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 20841579220 in words is "twenty billion, eight hundred forty-one million, five hundred seventy-nine thousand, two hundred twenty".