20053656 has 80 divisors (see below), whose sum is σ = 64207440. Its totient is φ = 5728320.

The previous prime is 20053639. The next prime is 20053673. The reversal of 20053656 is 65635002.

20053656 is a `hidden beast` number, since 2 + 0 + 0 + 5 + 3 + 656 = 666.

It is an interprime number because it is at equal distance from previous prime (20053639) and next prime (20053673).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2326 + ... + 6746.

It is an arithmetic number, because the mean of its divisors is an integer number (802593).

Almost surely, 2^20053656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20053656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32103720).

20053656 is an abundant number, since it is smaller than the sum of its proper divisors (44153784).

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

20053656 is a wasteful number, since it uses less digits than its factorization.

20053656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446 (or 4433 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 20053656 is about 4478.1308600799. The cubic root of 20053656 is about 271.6842862264.

Adding to 20053656 its reverse (65635002), we get a palindrome (85688658).

The spelling of 20053656 in words is "twenty million, fifty-three thousand, six hundred fifty-six".