2156852820 has 24 divisors (see below), whose sum is σ = 6039188064. Its totient is φ = 575160736.

The previous prime is 2156852813. The next prime is 2156852833. The reversal of 2156852820 is 282586512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17973714 + ... + 17973833.

It is an arithmetic number, because the mean of its divisors is an integer number (251632836).

Almost surely, 2^2156852820 is an apocalyptic number.

2156852820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2156852820 is an abundant number, since it is smaller than the sum of its proper divisors (3882335244).

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

2156852820 is a wasteful number, since it uses less digits than its factorization.

2156852820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35947559 (or 35947557 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 2156852820 is about 46441.9295464777. The cubic root of 2156852820 is about 1292.0326946201.

The spelling of 2156852820 in words is "two billion, one hundred fifty-six million, eight hundred fifty-two thousand, eight hundred twenty".