20487853 has 2 divisors, whose sum is σ = 20487854. Its totient is φ = 20487852.

The previous prime is 20487821. The next prime is 20487877. The reversal of 20487853 is 35878402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 3988009 = 4062^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 20487853 - 2⁵ = 20487821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20487893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10243926 + 10243927.

It is an arithmetic number, because the mean of its divisors is an integer number (10243927).

Almost surely, 2^20487853 is an apocalyptic number.

It is an amenable number.

20487853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20487853 is an equidigital number, since it uses as much as digits as its factorization.

20487853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 20487853 is about 4526.3509585537. The cubic root of 20487853 is about 273.6311168982.

The spelling of 20487853 in words is "twenty million, four hundred eighty-seven thousand, eight hundred fifty-three".