20605698 has 48 divisors (see below), whose sum is σ = 47141280. Its totient is φ = 6671520.

The previous prime is 20605661. The next prime is 20605699. The reversal of 20605698 is 89650602.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20605699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90661 + ... + 90887.

It is an arithmetic number, because the mean of its divisors is an integer number (982110).

Almost surely, 2^20605698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20605698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23570640).

20605698 is an abundant number, since it is smaller than the sum of its proper divisors (26535582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20605698 is a wasteful number, since it uses less digits than its factorization.

20605698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 20605698 is about 4539.3499534625. The cubic root of 20605698 is about 274.1547512347.

The spelling of 20605698 in words is "twenty million, six hundred five thousand, six hundred ninety-eight".