20548819 has 2 divisors, whose sum is σ = 20548820. Its totient is φ = 20548818.

The previous prime is 20548817. The next prime is 20548859. The reversal of 20548819 is 91884502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20548819 - 2¹ = 20548817 is a prime.

It is a super-2 number, since 2×20548819² = 844507924589522, which contains 22 as substring.

Together with 20548817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20548813) 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 as a sum of consecutive naturals, namely, 10274409 + 10274410.

It is an arithmetic number, because the mean of its divisors is an integer number (10274410).

Almost surely, 2^20548819 is an apocalyptic number.

20548819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20548819 is an equidigital number, since it uses as much as digits as its factorization.

20548819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 20548819 is about 4533.0805199114. The cubic root of 20548819 is about 273.9022641454.

The spelling of 20548819 in words is "twenty million, five hundred forty-eight thousand, eight hundred nineteen".