20244420 has 72 divisors (see below), whose sum is σ = 70185024. Its totient is φ = 4627008.

The previous prime is 20244409. The next prime is 20244431. The reversal of 20244420 is 2444202.

20244420 is a `hidden beast` number, since 2 + 0 + 244 + 420 = 666.

It is an interprime number because it is at equal distance from previous prime (20244409) and next prime (20244431).

It is a super-2 number, since 2×20244420² = 819673082272800, which contains 22 as substring.

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 = 20244393 and 20244402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6774 + ... + 9293.

It is an arithmetic number, because the mean of its divisors is an integer number (974792).

Almost surely, 2^20244420 is an apocalyptic number.

20244420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20244420 is an abundant number, since it is smaller than the sum of its proper divisors (49940604).

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

20244420 is a wasteful number, since it uses less digits than its factorization.

20244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16089 (or 16084 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20244420 is about 4499.3799572830. The cubic root of 20244420 is about 272.5430507412.

Adding to 20244420 its reverse (2444202), we get a palindrome (22688622).

The spelling of 20244420 in words is "twenty million, two hundred forty-four thousand, four hundred twenty".