20465621 has 8 divisors (see below), whose sum is σ = 22389600. Its totient is φ = 18552240.

The previous prime is 20465609. The next prime is 20465647. The reversal of 20465621 is 12656402.

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 20465621 - 2²² = 16271317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465321) 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, 1715 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (2798700).

Almost surely, 2^20465621 is an apocalyptic number.

It is an amenable number.

20465621 is a deficient number, since it is larger than the sum of its proper divisors (1923979).

20465621 is a wasteful number, since it uses less digits than its factorization.

20465621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5299.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20465621 is about 4523.8944505813. The cubic root of 20465621 is about 273.5321058935.

It can be divided in two parts, 2046 and 5621, that added together give a palindrome (7667).

The spelling of 20465621 in words is "twenty million, four hundred sixty-five thousand, six hundred twenty-one".