1020855 has 32 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 471680.

The previous prime is 1020853. The next prime is 1020881. The reversal of 1020855 is 5580201.

It is not a de Polignac number, because 1020855 - 2¹ = 1020853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3661 + ... + 3929.

It is an arithmetic number, because the mean of its divisors is an integer number (58320).

2^1020855 is an apocalyptic number.

1020855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1020855 is a deficient number, since it is larger than the sum of its proper divisors (845385).

1020855 is a wasteful number, since it uses less digits than its factorization.

1020855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1020855 is about 1010.3736932442. The cubic root of 1020855 is about 100.6903893236.

The spelling of 1020855 in words is "one million, twenty thousand, eight hundred fifty-five".