20544851 has 2 divisors, whose sum is σ = 20544852. Its totient is φ = 20544850.

The previous prime is 20544817. The next prime is 20544889. The reversal of 20544851 is 15844502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20544851 - 2⁶ = 20544787 is a prime.

It is a super-2 number, since 2×20544851² = 844181805224402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20540851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272425 + 10272426.

It is an arithmetic number, because the mean of its divisors is an integer number (10272426).

Almost surely, 2^20544851 is an apocalyptic number.

20544851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544851 is an equidigital number, since it uses as much as digits as its factorization.

20544851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 20544851 is about 4532.6428273139. The cubic root of 20544851 is about 273.8846327323.

The spelling of 20544851 in words is "twenty million, five hundred forty-four thousand, eight hundred fifty-one".