255021320 has 32 divisors (see below), whose sum is σ = 575455320. Its totient is φ = 101713920.

The previous prime is 255021317. The next prime is 255021329. The reversal of 255021320 is 23120552.

It can be written as a sum of positive squares in 4 ways, for example, as 226141444 + 28879876 = 15038^2 + 5374^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 255021292 and 255021301.

It is not an unprimeable number, because it can be changed into a prime (255021329) 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, 5090 + ... + 23150.

Almost surely, 2^255021320 is an apocalyptic number.

255021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255021320 is an abundant number, since it is smaller than the sum of its proper divisors (320434000).

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

255021320 is a wasteful number, since it uses less digits than its factorization.

255021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18425 (or 18421 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 255021320 is about 15969.3869638130. The cubic root of 255021320 is about 634.1502428648.

Adding to 255021320 its reverse (23120552), we get a palindrome (278141872).

The spelling of 255021320 in words is "two hundred fifty-five million, twenty-one thousand, three hundred twenty".