20913206 has 8 divisors (see below), whose sum is σ = 31389384. Its totient is φ = 10450080.

The previous prime is 20913203. The next prime is 20913229. The reversal of 20913206 is 60231902.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20913203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3821 + ... + 7511.

It is an arithmetic number, because the mean of its divisors is an integer number (3923673).

Almost surely, 2^20913206 is an apocalyptic number.

20913206 is a deficient number, since it is larger than the sum of its proper divisors (10476178).

20913206 is a wasteful number, since it uses less digits than its factorization.

20913206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6526.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20913206 is about 4573.0958879079. The cubic root of 20913206 is about 275.5118006195.

The spelling of 20913206 in words is "twenty million, nine hundred thirteen thousand, two hundred six".