20698081 has 2 divisors, whose sum is σ = 20698082. Its totient is φ = 20698080.

The previous prime is 20698063. The next prime is 20698099. The reversal of 20698081 is 18089602.

It is a balanced prime because it is at equal distance from previous prime (20698063) and next prime (20698099).

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 5837056 = 3855^2 + 2416^2 .

It is a cyclic number.

It is not a de Polignac number, because 20698081 - 2¹¹ = 20696033 is a prime.

It is a super-2 number, since 2×20698081² = 856821114165122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20698681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10349040 + 10349041.

It is an arithmetic number, because the mean of its divisors is an integer number (10349041).

Almost surely, 2^20698081 is an apocalyptic number.

It is an amenable number.

20698081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20698081 is an equidigital number, since it uses as much as digits as its factorization.

20698081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 20698081 is about 4549.5143696883. The cubic root of 20698081 is about 274.5638529939.

The spelling of 20698081 in words is "twenty million, six hundred ninety-eight thousand, eighty-one".