20655656 has 96 divisors (see below), whose sum is σ = 49248000. Its totient is φ = 8072064.

The previous prime is 20655653. The next prime is 20655659. The reversal of 20655656 is 65655602.

It is an interprime number because it is at equal distance from previous prime (20655653) and next prime (20655659).

It is a super-2 number, since 2×20655656² = 853312249580672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20655653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 261425 + ... + 261503.

It is an arithmetic number, because the mean of its divisors is an integer number (513000).

Almost surely, 2^20655656 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 20655656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24624000).

20655656 is an abundant number, since it is smaller than the sum of its proper divisors (28592344).

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

20655656 is a wasteful number, since it uses less digits than its factorization.

20655656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 20655656 is about 4544.8493924442. The cubic root of 20655656 is about 274.3761328679.

The spelling of 20655656 in words is "twenty million, six hundred fifty-five thousand, six hundred fifty-six".