20309930 has 16 divisors (see below), whose sum is σ = 36616104. Its totient is φ = 8111040.

The previous prime is 20309923. The next prime is 20309941. The reversal of 20309930 is 3990302.

It can be written as a sum of positive squares in 4 ways, for example, as 3964081 + 16345849 = 1991^2 + 4043^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20309930.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7340 + ... + 9720.

Almost surely, 2^20309930 is an apocalyptic number.

20309930 is a deficient number, since it is larger than the sum of its proper divisors (16306174).

20309930 is a wasteful number, since it uses less digits than its factorization.

20309930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 20309930 is about 4506.6539694101. The cubic root of 20309930 is about 272.8367130811.

The spelling of 20309930 in words is "twenty million, three hundred nine thousand, nine hundred thirty".