20055921 has 4 divisors (see below), whose sum is σ = 26741232. Its totient is φ = 13370612.

The previous prime is 20055913. The next prime is 20055923. The reversal of 20055921 is 12955002.

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 20055921 - 2³ = 20055913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20055891 and 20055900.

It is not an unprimeable number, because it can be changed into a prime (20055923) 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, 3342651 + ... + 3342656.

It is an arithmetic number, because the mean of its divisors is an integer number (6685308).

Almost surely, 2^20055921 is an apocalyptic number.

It is an amenable number.

20055921 is a deficient number, since it is larger than the sum of its proper divisors (6685311).

20055921 is an equidigital number, since it uses as much as digits as its factorization.

20055921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685310.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20055921 is about 4478.3837486307. The cubic root of 20055921 is about 271.6945144817.

The spelling of 20055921 in words is "twenty million, fifty-five thousand, nine hundred twenty-one".