20869562844 has 180 divisors, whose sum is σ = 60057307464. Its totient is φ = 6281976384.

The previous prime is 20869562821. The next prime is 20869562849. The reversal of 20869562844 is 44826596802.

20869562844 is a `hidden beast` number, since 2 + 0 + 8 + 6 + 9 + 5 + 628 + 4 + 4 = 666.

It is a super-4 number, since 4×20869562844⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869562849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 9303187 + ... + 9305429.

Almost surely, 2^20869562844 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 20869562844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30028653732).

20869562844 is an abundant number, since it is smaller than the sum of its proper divisors (39187744620).

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

20869562844 is a wasteful number, since it uses less digits than its factorization.

20869562844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2308 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 20869562844 in words is "twenty billion, eight hundred sixty-nine million, five hundred sixty-two thousand, eight hundred forty-four".