20024021 has 8 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 19373728.

The previous prime is 20024009. The next prime is 20024077. The reversal of 20024021 is 12042002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20024021 is a prime.

It is a super-2 number, since 2×20024021² = 801922834016882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20023993 and 20024011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20024821) 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, 1790 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^20024021 is an apocalyptic number.

It is an amenable number.

20024021 is a deficient number, since it is larger than the sum of its proper divisors (660139).

20024021 is an equidigital number, since it uses as much as digits as its factorization.

20024021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923.

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

The square root of 20024021 is about 4474.8207785340. The cubic root of 20024021 is about 271.5503898911.

Adding to 20024021 its reverse (12042002), we get a palindrome (32066023).

The spelling of 20024021 in words is "twenty million, twenty-four thousand, twenty-one".