4020636 has 24 divisors (see below), whose sum is σ = 9933840. Its totient is φ = 1261312.

The previous prime is 4020631. The next prime is 4020637. The reversal of 4020636 is 6360204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9651 + ... + 10058.

It is an arithmetic number, because the mean of its divisors is an integer number (413910).

Almost surely, 2^4020636 is an apocalyptic number.

It is an amenable number.

4020636 is an abundant number, since it is smaller than the sum of its proper divisors (5913204).

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

4020636 is a wasteful number, since it uses less digits than its factorization.

4020636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19733 (or 19731 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 4020636 is about 2005.1523632881. The cubic root of 4020636 is about 159.0126171705.

It can be divided in two parts, 4020 and 636, that added together give a triangular number (4656 = T₉₆).

The spelling of 4020636 in words is "four million, twenty thousand, six hundred thirty-six".