20689104 has 40 divisors (see below), whose sum is σ = 53647360. Its totient is φ = 6870528.

The previous prime is 20689103. The next prime is 20689111. The reversal of 20689104 is 40198602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15537 + ... + 16815.

It is an arithmetic number, because the mean of its divisors is an integer number (1341184).

Almost surely, 2^20689104 is an apocalyptic number.

20689104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20689104 is an abundant number, since it is smaller than the sum of its proper divisors (32958256).

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

20689104 is a wasteful number, since it uses less digits than its factorization.

20689104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20689104 is about 4548.5276738743. The cubic root of 20689104 is about 274.5241534017.

The spelling of 20689104 in words is "twenty million, six hundred eighty-nine thousand, one hundred four".