20285656 has 32 divisors (see below), whose sum is σ = 39588480. Its totient is φ = 9734400.

The previous prime is 20285653. The next prime is 20285659. The reversal of 20285656 is 65658202.

It is an interprime number because it is at equal distance from previous prime (20285653) and next prime (20285659).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285653) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38676 + ... + 39196.

It is an arithmetic number, because the mean of its divisors is an integer number (1237140).

Almost surely, 2^20285656 is an apocalyptic number.

It is an amenable number.

20285656 is a deficient number, since it is larger than the sum of its proper divisors (19302824).

20285656 is a wasteful number, since it uses less digits than its factorization.

20285656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20285656 is about 4503.9600353467. The cubic root of 20285656 is about 272.7279735201.

It can be divided in two parts, 202 and 85656, that added together give a palindrome (85858).

The spelling of 20285656 in words is "twenty million, two hundred eighty-five thousand, six hundred fifty-six".