20422656 has 84 divisors (see below), whose sum is σ = 59208162. Its totient is φ = 6782976.

The previous prime is 20422651. The next prime is 20422657. The reversal of 20422656 is 65622402.

20422656 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 2 + 656 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19501056 + 921600 = 4416^2 + 960^2 .

It is not an unprimeable number, because it can be changed into a prime (20422651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73590 + ... + 73866.

Almost surely, 2^20422656 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 20422656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29604081).

20422656 is an abundant number, since it is smaller than the sum of its proper divisors (38785506).

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

20422656 is an equidigital number, since it uses as much as digits as its factorization.

20422656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 20422656 is about 4519.1432816409. The cubic root of 20422656 is about 273.3405563562.

The spelling of 20422656 in words is "twenty million, four hundred twenty-two thousand, six hundred fifty-six".