20650621 has 8 divisors (see below), whose sum is σ = 21353024. Its totient is φ = 19958400.

The previous prime is 20650607. The next prime is 20650657. The reversal of 20650621 is 12605602.

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 20650621 - 2⁵ = 20650589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20650592 and 20650601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20650601) 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, 1696 + ... + 6646.

It is an arithmetic number, because the mean of its divisors is an integer number (2669128).

Almost surely, 2^20650621 is an apocalyptic number.

It is an amenable number.

20650621 is a deficient number, since it is larger than the sum of its proper divisors (702403).

20650621 is an equidigital number, since it uses as much as digits as its factorization.

20650621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5091.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20650621 is about 4544.2954349382. The cubic root of 20650621 is about 274.3538371814.

The spelling of 20650621 in words is "twenty million, six hundred fifty thousand, six hundred twenty-one".