20929930 has 16 divisors (see below), whose sum is σ = 43056000. Its totient is φ = 7175952.

The previous prime is 20929919. The next prime is 20929939. The reversal of 20929930 is 3992902.

It is not an unprimeable number, because it can be changed into a prime (20929939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149430 + ... + 149569.

It is an arithmetic number, because the mean of its divisors is an integer number (2691000).

Almost surely, 2^20929930 is an apocalyptic number.

20929930 is an abundant number, since it is smaller than the sum of its proper divisors (22126070).

20929930 is a wasteful number, since it uses less digits than its factorization.

20929930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299013.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 20929930 is about 4574.9240430853. The cubic root of 20929930 is about 275.5852220367.

The spelling of 20929930 in words is "twenty million, nine hundred twenty-nine thousand, nine hundred thirty".