20965998 has 16 divisors (see below), whose sum is σ = 44398800. Its totient is φ = 6577536.

The previous prime is 20965993. The next prime is 20966003. The reversal of 20965998 is 89956902.

It is an interprime number because it is at equal distance from previous prime (20965993) and next prime (20966003).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20965991) 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 in 7 ways as a sum of consecutive naturals, for example, 102673 + ... + 102876.

It is an arithmetic number, because the mean of its divisors is an integer number (2774925).

Almost surely, 2^20965998 is an apocalyptic number.

20965998 is an abundant number, since it is smaller than the sum of its proper divisors (23432802).

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

20965998 is a wasteful number, since it uses less digits than its factorization.

20965998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205571.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 20965998 is about 4578.8642696634. The cubic root of 20965998 is about 275.7434341215.

The spelling of 20965998 in words is "twenty million, nine hundred sixty-five thousand, nine hundred ninety-eight".