20859930 has 160 divisors (see below), whose sum is σ = 69277824. Its totient is φ = 4385664.

The previous prime is 20859893. The next prime is 20859953. The reversal of 20859930 is 3995802.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 73569 + ... + 73851.

Almost surely, 2^20859930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20859930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34638912).

20859930 is an abundant number, since it is smaller than the sum of its proper divisors (48417894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20859930 is a wasteful number, since it uses less digits than its factorization.

20859930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20859930 is about 4567.2672354483. The cubic root of 20859930 is about 275.2776479589.

The spelling of 20859930 in words is "twenty million, eight hundred fifty-nine thousand, nine hundred thirty".