20538863 has 2 divisors, whose sum is σ = 20538864. Its totient is φ = 20538862.

The previous prime is 20538841. The next prime is 20538871. The reversal of 20538863 is 36883502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20538863 - 2¹⁸ = 20276719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538823) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269431 + 10269432.

It is an arithmetic number, because the mean of its divisors is an integer number (10269432).

Almost surely, 2^20538863 is an apocalyptic number.

20538863 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538863 is an equidigital number, since it uses as much as digits as its factorization.

20538863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20538863 is about 4531.9822373880. The cubic root of 20538863 is about 273.8580213519.

The spelling of 20538863 in words is "twenty million, five hundred thirty-eight thousand, eight hundred sixty-three".