20796421 has 4 divisors (see below), whose sum is σ = 20998432. Its totient is φ = 20594412.

The previous prime is 20796401. The next prime is 20796449. The reversal of 20796421 is 12469702.

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-20796421 is a prime.

It is a super-2 number, since 2×20796421² = 864982252818482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20796401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100851 + ... + 101056.

It is an arithmetic number, because the mean of its divisors is an integer number (5249608).

Almost surely, 2^20796421 is an apocalyptic number.

It is an amenable number.

20796421 is a deficient number, since it is larger than the sum of its proper divisors (202011).

20796421 is a wasteful number, since it uses less digits than its factorization.

20796421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202010.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20796421 is about 4560.3093096850. The cubic root of 20796421 is about 274.9979988835.

The spelling of 20796421 in words is "twenty million, seven hundred ninety-six thousand, four hundred twenty-one".