20689496 has 8 divisors (see below), whose sum is σ = 38792820. Its totient is φ = 10344744.

The previous prime is 20689483. The next prime is 20689511. The reversal of 20689496 is 69498602.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1293086 + ... + 1293101.

Almost surely, 2^20689496 is an apocalyptic number.

It is an amenable number.

20689496 is a deficient number, since it is larger than the sum of its proper divisors (18103324).

20689496 is a wasteful number, since it uses less digits than its factorization.

20689496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586193 (or 2586189 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 20689496 is about 4548.5707645369. The cubic root of 20689496 is about 274.5258872095.

The spelling of 20689496 in words is "twenty million, six hundred eighty-nine thousand, four hundred ninety-six".