255017820 has 48 divisors (see below), whose sum is σ = 725766048. Its totient is φ = 66888960.

The previous prime is 255017797. The next prime is 255017849. The reversal of 255017820 is 28710552.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31179 + ... + 38498.

It is an arithmetic number, because the mean of its divisors is an integer number (15120126).

Almost surely, 2^255017820 is an apocalyptic number.

255017820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255017820 is an abundant number, since it is smaller than the sum of its proper divisors (470748228).

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

255017820 is a wasteful number, since it uses less digits than its factorization.

255017820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69750 (or 69748 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 255017820 is about 15969.2773787670. The cubic root of 255017820 is about 634.1473417531.

The spelling of 255017820 in words is "two hundred fifty-five million, seventeen thousand, eight hundred twenty".