869772020 has 72 divisors (see below), whose sum is σ = 2094312024. Its totient is φ = 302235648.

The previous prime is 869772019. The next prime is 869772049. The reversal of 869772020 is 20277968.

It can be written as a sum of positive squares in 12 ways, for example, as 321556624 + 548215396 = 17932^2 + 23414^2 .

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 49892 + ... + 65028.

It is an arithmetic number, because the mean of its divisors is an integer number (29087667).

Almost surely, 2^869772020 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 869772020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1047156012).

869772020 is an abundant number, since it is smaller than the sum of its proper divisors (1224540004).

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

869772020 is a wasteful number, since it uses less digits than its factorization.

869772020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15189 (or 15174 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 869772020 is about 29491.8975313560. The cubic root of 869772020 is about 954.5568771037.

The spelling of 869772020 in words is "eight hundred sixty-nine million, seven hundred seventy-two thousand, twenty".