20698487 has 2 divisors, whose sum is σ = 20698488. Its totient is φ = 20698486.

The previous prime is 20698477. The next prime is 20698501. The reversal of 20698487 is 78489602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20698487 - 2¹⁰ = 20697463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20698477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349243 + 10349244.

It is an arithmetic number, because the mean of its divisors is an integer number (10349244).

Almost surely, 2^20698487 is an apocalyptic number.

20698487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698487 is an equidigital number, since it uses as much as digits as its factorization.

20698487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 20698487 is about 4549.5589896165. The cubic root of 20698487 is about 274.5656482037.

The spelling of 20698487 in words is "twenty million, six hundred ninety-eight thousand, four hundred eighty-seven".