20551873 has 4 divisors (see below), whose sum is σ = 20841408. Its totient is φ = 20262340.

The previous prime is 20551871. The next prime is 20551877. The reversal of 20551873 is 37815502.

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 20551873 - 2¹ = 20551871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20551871) 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, 144661 + ... + 144802.

It is an arithmetic number, because the mean of its divisors is an integer number (5210352).

Almost surely, 2^20551873 is an apocalyptic number.

It is an amenable number.

20551873 is a deficient number, since it is larger than the sum of its proper divisors (289535).

20551873 is an equidigital number, since it uses as much as digits as its factorization.

20551873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289534.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 20551873 is about 4533.4173644173. The cubic root of 20551873 is about 273.9158327448.

The spelling of 20551873 in words is "twenty million, five hundred fifty-one thousand, eight hundred seventy-three".