20555131 has 12 divisors (see below), whose sum is σ = 22055880. Its totient is φ = 19103040.

The previous prime is 20555083. The next prime is 20555141. The reversal of 20555131 is 13155502.

It is not a de Polignac number, because 20555131 - 2¹⁵ = 20522363 is a prime.

It is a super-2 number, since 2×20555131² = 845026820854322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20555141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85171 + ... + 85411.

It is an arithmetic number, because the mean of its divisors is an integer number (1837990).

Almost surely, 2^20555131 is an apocalyptic number.

20555131 is a deficient number, since it is larger than the sum of its proper divisors (1500749).

20555131 is an equidigital number, since it uses as much as digits as its factorization.

20555131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 20555131 is about 4533.7766817522. The cubic root of 20555131 is about 273.9303062128.

The spelling of 20555131 in words is "twenty million, five hundred fifty-five thousand, one hundred thirty-one".