27820031 has 4 divisors (see below), whose sum is σ = 27900552. Its totient is φ = 27739512.

The previous prime is 27820021. The next prime is 27820043. The reversal of 27820031 is 13002872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27820031 - 2¹⁴ = 27803647 is a prime.

It is a super-2 number, since 2×27820031² = 1547908249681922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27819979 and 27820006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27820021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39740 + ... + 40433.

It is an arithmetic number, because the mean of its divisors is an integer number (6975138).

Almost surely, 2^27820031 is an apocalyptic number.

27820031 is a deficient number, since it is larger than the sum of its proper divisors (80521).

27820031 is an equidigital number, since it uses as much as digits as its factorization.

27820031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80520.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 27820031 is about 5274.4697363811. The cubic root of 27820031 is about 303.0069127448.

The spelling of 27820031 in words is "twenty-seven million, eight hundred twenty thousand, thirty-one".