20898811 has 4 divisors (see below), whose sum is σ = 20970432. Its totient is φ = 20827192.

The previous prime is 20898809. The next prime is 20898827. The reversal of 20898811 is 11889802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20898811 - 2¹ = 20898809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20898851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35371 + ... + 35956.

It is an arithmetic number, because the mean of its divisors is an integer number (5242608).

Almost surely, 2^20898811 is an apocalyptic number.

20898811 is a deficient number, since it is larger than the sum of its proper divisors (71621).

20898811 is an equidigital number, since it uses as much as digits as its factorization.

20898811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71620.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 20898811 is about 4571.5217378899. The cubic root of 20898811 is about 275.4485725858.

Subtracting from 20898811 its reverse (11889802), we obtain a palindrome (9009009).

The spelling of 20898811 in words is "twenty million, eight hundred ninety-eight thousand, eight hundred eleven".