20454220 has 24 divisors (see below), whose sum is σ = 43039584. Its totient is φ = 8165376.

The previous prime is 20454211. The next prime is 20454221. The reversal of 20454220 is 2245402.

It is not an unprimeable number, because it can be changed into a prime (20454221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17164 + ... + 18316.

It is an arithmetic number, because the mean of its divisors is an integer number (1793316).

Almost surely, 2^20454220 is an apocalyptic number.

20454220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20454220 is an abundant number, since it is smaller than the sum of its proper divisors (22585364).

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

20454220 is a wasteful number, since it uses less digits than its factorization.

20454220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049 (or 2047 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20454220 is about 4522.6341881695. The cubic root of 20454220 is about 273.4813033172.

Adding to 20454220 its reverse (2245402), we get a palindrome (22699622).

The spelling of 20454220 in words is "twenty million, four hundred fifty-four thousand, two hundred twenty".