20531055 has 8 divisors (see below), whose sum is σ = 32849712. Its totient is φ = 10949888.

The previous prime is 20531023. The next prime is 20531059. The reversal of 20531055 is 55013502.

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 20531055 - 2⁵ = 20531023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684354 + ... + 684383.

It is an arithmetic number, because the mean of its divisors is an integer number (4106214).

Almost surely, 2^20531055 is an apocalyptic number.

20531055 is a deficient number, since it is larger than the sum of its proper divisors (12318657).

20531055 is a wasteful number, since it uses less digits than its factorization.

20531055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368745.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 20531055 is about 4531.1207222938. The cubic root of 20531055 is about 273.8233139056.

Adding to 20531055 its reverse (55013502), we get a palindrome (75544557).

The spelling of 20531055 in words is "twenty million, five hundred thirty-one thousand, fifty-five".