20462220 has 120 divisors (see below), whose sum is σ = 68058144. Its totient is φ = 5128704.

The previous prime is 20462209. The next prime is 20462227. The reversal of 20462220 is 2226402.

It is a happy number.

20462220 is a `hidden beast` number, since 20 + 4 + 622 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20462193 and 20462202.

It is not an unprimeable number, because it can be changed into a prime (20462227) 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 39 ways as a sum of consecutive naturals, for example, 27169 + ... + 27911.

Almost surely, 2^20462220 is an apocalyptic number.

20462220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20462220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34029072).

20462220 is an abundant number, since it is smaller than the sum of its proper divisors (47595924).

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

20462220 is a wasteful number, since it uses less digits than its factorization.

20462220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 770 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 20462220 is about 4523.5185420201. The cubic root of 20462220 is about 273.5169530960.

Adding to 20462220 its reverse (2226402), we get a palindrome (22688622).

The spelling of 20462220 in words is "twenty million, four hundred sixty-two thousand, two hundred twenty".