1020636 has 18 divisors (see below), whose sum is σ = 2580032. Its totient is φ = 340200.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020636 is 6360201.

It is a happy number.

1020636 is a `hidden beast` number, since 10 + 20 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14140 + ... + 14211.

2^1020636 is an apocalyptic number.

It is an amenable number.

1020636 is an abundant number, since it is smaller than the sum of its proper divisors (1559396).

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

1020636 is a wasteful number, since it uses less digits than its factorization.

1020636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28361 (or 28356 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1020636 is about 1010.2653116880. The cubic root of 1020636 is about 100.6831885712.

Adding to 1020636 its reverse (6360201), we get a palindrome (7380837).

The spelling of 1020636 in words is "one million, twenty thousand, six hundred thirty-six".