20906359 has 4 divisors (see below), whose sum is σ = 21071104. Its totient is φ = 20741616.

The previous prime is 20906341. The next prime is 20906371. The reversal of 20906359 is 95360902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20906359 - 2¹³ = 20898167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20906329) 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, 82182 + ... + 82435.

It is an arithmetic number, because the mean of its divisors is an integer number (5267776).

Almost surely, 2^20906359 is an apocalyptic number.

20906359 is a deficient number, since it is larger than the sum of its proper divisors (164745).

20906359 is a wasteful number, since it uses less digits than its factorization.

20906359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164744.

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 20906359 is about 4572.3472090383. The cubic root of 20906359 is about 275.4817297445.

The spelling of 20906359 in words is "twenty million, nine hundred six thousand, three hundred fifty-nine".