20688473 has 24 divisors (see below), whose sum is σ = 25034400. Its totient is φ = 16982784.

The previous prime is 20688463. The next prime is 20688517. The reversal of 20688473 is 37488602.

It is not a de Polignac number, because 20688473 - 2¹⁰ = 20687449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20688433) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54398 + ... + 54776.

It is an arithmetic number, because the mean of its divisors is an integer number (1043100).

Almost surely, 2^20688473 is an apocalyptic number.

It is an amenable number.

20688473 is a deficient number, since it is larger than the sum of its proper divisors (4345927).

20688473 is a wasteful number, since it uses less digits than its factorization.

20688473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20688473 is about 4548.4583102410. The cubic root of 20688473 is about 274.5213624559.

The spelling of 20688473 in words is "twenty million, six hundred eighty-eight thousand, four hundred seventy-three".