20909678 has 8 divisors (see below), whose sum is σ = 31513800. Its totient is φ = 10405080.

The previous prime is 20909657. The next prime is 20909701. The reversal of 20909678 is 87690902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24353 + ... + 25196.

It is an arithmetic number, because the mean of its divisors is an integer number (3939225).

Almost surely, 2^20909678 is an apocalyptic number.

20909678 is a deficient number, since it is larger than the sum of its proper divisors (10604122).

20909678 is a wasteful number, since it uses less digits than its factorization.

20909678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49762.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20909678 is about 4572.7101373256. The cubic root of 20909678 is about 275.4963070553.

The spelling of 20909678 in words is "twenty million, nine hundred nine thousand, six hundred seventy-eight".