20422188 has 72 divisors (see below), whose sum is σ = 55218800. Its totient is φ = 6345216.

The previous prime is 20422159. The next prime is 20422189. The reversal of 20422188 is 88122402.

It is not an unprimeable number, because it can be changed into a prime (20422189) 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, 49728 + ... + 50136.

Almost surely, 2^20422188 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 20422188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27609400).

20422188 is an abundant number, since it is smaller than the sum of its proper divisors (34796612).

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

20422188 is a wasteful number, since it uses less digits than its factorization.

20422188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 20422188 is about 4519.0915016184. The cubic root of 20422188 is about 273.3384684077.

The spelling of 20422188 in words is "twenty million, four hundred twenty-two thousand, one hundred eighty-eight".