1020644 has 12 divisors (see below), whose sum is σ = 1843968. Its totient is φ = 493800.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020644 is 4460201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3992 + ... + 4239.

It is an arithmetic number, because the mean of its divisors is an integer number (153664).

2^1020644 is an apocalyptic number.

It is an amenable number.

1020644 is a deficient number, since it is larger than the sum of its proper divisors (823324).

1020644 is a wasteful number, since it uses less digits than its factorization.

1020644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8266 (or 8264 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1020644 is about 1010.2692710362. The cubic root of 1020644 is about 100.6834516305.

Adding to 1020644 its reverse (4460201), we get a palindrome (5480845).

The spelling of 1020644 in words is "one million, twenty thousand, six hundred forty-four".