20024621 has 4 divisors (see below), whose sum is σ = 20079552. Its totient is φ = 19969692.

The previous prime is 20024611. The next prime is 20024633. The reversal of 20024621 is 12642002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20024621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20024621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20024611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26915 + ... + 27648.

It is an arithmetic number, because the mean of its divisors is an integer number (5019888).

Almost surely, 2^20024621 is an apocalyptic number.

It is an amenable number.

20024621 is a deficient number, since it is larger than the sum of its proper divisors (54931).

20024621 is an equidigital number, since it uses as much as digits as its factorization.

20024621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54930.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20024621 is about 4474.8878198230. The cubic root of 20024621 is about 271.5531021103.

Adding to 20024621 its reverse (12642002), we get a palindrome (32666623).

The spelling of 20024621 in words is "twenty million, twenty-four thousand, six hundred twenty-one".