20252621 has 8 divisors (see below), whose sum is σ = 20563200. Its totient is φ = 19944400.

The previous prime is 20252611. The next prime is 20252663. The reversal of 20252621 is 12625202.

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 20252621 - 2¹⁰ = 20251597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20252593 and 20252602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20252611) 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, 23720 + ... + 24558.

It is an arithmetic number, because the mean of its divisors is an integer number (2570400).

Almost surely, 2^20252621 is an apocalyptic number.

It is an amenable number.

20252621 is a deficient number, since it is larger than the sum of its proper divisors (310579).

20252621 is a wasteful number, since it uses less digits than its factorization.

20252621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20252621 is about 4500.2912127995. The cubic root of 20252621 is about 272.5798481041.

Adding to 20252621 its reverse (12625202), we get a palindrome (32877823).

The spelling of 20252621 in words is "twenty million, two hundred fifty-two thousand, six hundred twenty-one".