20930638 has 8 divisors (see below), whose sum is σ = 33242832. Its totient is φ = 9849696.

The previous prime is 20930629. The next prime is 20930669. The reversal of 20930638 is 83603902.

It is a happy number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307770 + ... + 307837.

It is an arithmetic number, because the mean of its divisors is an integer number (4155354).

Almost surely, 2^20930638 is an apocalyptic number.

20930638 is a deficient number, since it is larger than the sum of its proper divisors (12312194).

20930638 is a wasteful number, since it uses less digits than its factorization.

20930638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615626.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20930638 is about 4575.0014207648. The cubic root of 20930638 is about 275.5883294231.

The spelling of 20930638 in words is "twenty million, nine hundred thirty thousand, six hundred thirty-eight".