20273921 has 4 divisors (see below), whose sum is σ = 20376000. Its totient is φ = 20171844.

The previous prime is 20273909. The next prime is 20273927. The reversal of 20273921 is 12937202.

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 not a de Polignac number, because 20273921 - 2¹⁰ = 20272897 is a prime.

It is a super-2 number, since 2×20273921² = 822063745428482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20273927) 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, 50741 + ... + 51138.

It is an arithmetic number, because the mean of its divisors is an integer number (5094000).

Almost surely, 2^20273921 is an apocalyptic number.

It is an amenable number.

20273921 is a deficient number, since it is larger than the sum of its proper divisors (102079).

20273921 is a wasteful number, since it uses less digits than its factorization.

20273921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102078.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20273921 is about 4502.6571044218. The cubic root of 20273921 is about 272.6753734610.

The spelling of 20273921 in words is "twenty million, two hundred seventy-three thousand, nine hundred twenty-one".