20002421 has 8 divisors (see below), whose sum is σ = 22294080. Its totient is φ = 17834688.

The previous prime is 20002417. The next prime is 20002429. The reversal of 20002421 is 12420002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20002421 - 2² = 20002417 is a prime.

It is a super-2 number, since 2×20002421² = 800193691722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002429) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30641 + ... + 31286.

It is an arithmetic number, because the mean of its divisors is an integer number (2786760).

Almost surely, 2^20002421 is an apocalyptic number.

It is an amenable number.

20002421 is a deficient number, since it is larger than the sum of its proper divisors (2291659).

20002421 is a wasteful number, since it uses less digits than its factorization.

20002421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61963.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20002421 is about 4472.4066228374. The cubic root of 20002421 is about 271.4527138927.

Adding to 20002421 its reverse (12420002), we get a palindrome (32422423).

The spelling of 20002421 in words is "twenty million, two thousand, four hundred twenty-one".