20656080 has 160 divisors (see below), whose sum is σ = 72673920. Its totient is φ = 5391360.

The previous prime is 20656079. The next prime is 20656081. The reversal of 20656080 is 8065602.

20656080 is a `hidden beast` number, since 2 + 0 + 656 + 0 + 8 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (20656079) and next prime (20656081).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157615 + ... + 157745.

It is an arithmetic number, because the mean of its divisors is an integer number (454212).

Almost surely, 2^20656080 is an apocalyptic number.

20656080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20656080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36336960).

20656080 is an abundant number, since it is smaller than the sum of its proper divisors (52017840).

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

20656080 is a wasteful number, since it uses less digits than its factorization.

20656080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20656080 is about 4544.8960384150. The cubic root of 20656080 is about 274.3780102340.

It can be divided in two parts, 20 and 656080, that added together give a square (656100 = 810²).

The spelling of 20656080 in words is "twenty million, six hundred fifty-six thousand, eighty".