20999606 has 8 divisors (see below), whose sum is σ = 31794120. Its totient is φ = 10401568.

The previous prime is 20999597. The next prime is 20999623. The reversal of 20999606 is 60699902.

It is a happy number.

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

It is a super-3 number, since 3×20999606³ (a number of 23 digits) contains 333 as substring.

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, 48851 + ... + 49278.

It is an arithmetic number, because the mean of its divisors is an integer number (3974265).

Almost surely, 2^20999606 is an apocalyptic number.

20999606 is a deficient number, since it is larger than the sum of its proper divisors (10794514).

20999606 is a wasteful number, since it uses less digits than its factorization.

20999606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98238.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 20999606 is about 4582.5327058298. The cubic root of 20999606 is about 275.8906922049.

The spelling of 20999606 in words is "twenty million, nine hundred ninety-nine thousand, six hundred six".