20540851 has 2 divisors, whose sum is σ = 20540852. Its totient is φ = 20540850.

The previous prime is 20540837. The next prime is 20540873. The reversal of 20540851 is 15804502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20540851 - 2⁹ = 20540339 is a prime.

It is not a weakly prime, because it can be changed into another prime (20540831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270425 + 10270426.

It is an arithmetic number, because the mean of its divisors is an integer number (10270426).

Almost surely, 2^20540851 is an apocalyptic number.

20540851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540851 is an equidigital number, since it uses as much as digits as its factorization.

20540851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 20540851 is about 4532.2015621550. The cubic root of 20540851 is about 273.8668568325.

The spelling of 20540851 in words is "twenty million, five hundred forty thousand, eight hundred fifty-one".