20716406 has 4 divisors (see below), whose sum is σ = 31074612. Its totient is φ = 10358202.

The previous prime is 20716391. The next prime is 20716417. The reversal of 20716406 is 60461702.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5179100 + ... + 5179103.

It is an arithmetic number, because the mean of its divisors is an integer number (7768653).

Almost surely, 2^20716406 is an apocalyptic number.

20716406 is a deficient number, since it is larger than the sum of its proper divisors (10358206).

20716406 is a wasteful number, since it uses less digits than its factorization.

20716406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10358205.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20716406 is about 4551.5278753403. The cubic root of 20716406 is about 274.6448572586.

The spelling of 20716406 in words is "twenty million, seven hundred sixteen thousand, four hundred six".