255706820 has 24 divisors (see below), whose sum is σ = 537886104. Its totient is φ = 102110976.

The previous prime is 255706819. The next prime is 255706823. The reversal of 255706820 is 28607552.

It can be written as a sum of positive squares in 4 ways, for example, as 18731584 + 236975236 = 4328^2 + 15394^2 .

It is not an unprimeable number, because it can be changed into a prime (255706823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1832 + ... + 22688.

It is an arithmetic number, because the mean of its divisors is an integer number (22411921).

Almost surely, 2^255706820 is an apocalyptic number.

255706820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255706820 is an abundant number, since it is smaller than the sum of its proper divisors (282179284).

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

255706820 is a wasteful number, since it uses less digits than its factorization.

255706820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21479 (or 21477 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 255706820 is about 15990.8355003733. The cubic root of 255706820 is about 634.7179353626.

The spelling of 255706820 in words is "two hundred fifty-five million, seven hundred six thousand, eight hundred twenty".