20422320 has 40 divisors (see below), whose sum is σ = 63309936. Its totient is φ = 5445888.

The previous prime is 20422313. The next prime is 20422343. The reversal of 20422320 is 2322402.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20422320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42307 + ... + 42786.

Almost surely, 2^20422320 is an apocalyptic number.

20422320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20422320 is an abundant number, since it is smaller than the sum of its proper divisors (42887616).

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

20422320 is a wasteful number, since it uses less digits than its factorization.

20422320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85109 (or 85103 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20422320 is about 4519.1061063002. The cubic root of 20422320 is about 273.3390573195.

Adding to 20422320 its reverse (2322402), we get a palindrome (22744722).

The spelling of 20422320 in words is "twenty million, four hundred twenty-two thousand, three hundred twenty".