20554139 has 8 divisors (see below), whose sum is σ = 21854448. Its totient is φ = 19264000.

The previous prime is 20554123. The next prime is 20554151. The reversal of 20554139 is 93145502.

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 20554139 - 2⁴ = 20554123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20554109) 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, 1859 + ... + 6675.

It is an arithmetic number, because the mean of its divisors is an integer number (2731806).

Almost surely, 2^20554139 is an apocalyptic number.

20554139 is a deficient number, since it is larger than the sum of its proper divisors (1300309).

20554139 is a wasteful number, since it uses less digits than its factorization.

20554139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5085.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20554139 is about 4533.6672793667. The cubic root of 20554139 is about 273.9258994747.

The spelling of 20554139 in words is "twenty million, five hundred fifty-four thousand, one hundred thirty-nine".