20145422 has 16 divisors (see below), whose sum is σ = 33668352. Its totient is φ = 8961720.

The previous prime is 20145421. The next prime is 20145449. The reversal of 20145422 is 22454102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20145394 and 20145403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8708 + ... + 10775.

It is an arithmetic number, because the mean of its divisors is an integer number (2104272).

Almost surely, 2^20145422 is an apocalyptic number.

20145422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20145422 is a deficient number, since it is larger than the sum of its proper divisors (13522930).

20145422 is a wasteful number, since it uses less digits than its factorization.

20145422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19543.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 20145422 is about 4488.3651812213. The cubic root of 20145422 is about 272.0980669311.

Adding to 20145422 its reverse (22454102), we get a palindrome (42599524).

The spelling of 20145422 in words is "twenty million, one hundred forty-five thousand, four hundred twenty-two".