20308930 has 32 divisors (see below), whose sum is σ = 37920960. Its totient is φ = 7824960.

The previous prime is 20308919. The next prime is 20308933. The reversal of 20308930 is 3980302.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20308895 and 20308904.

It is not an unprimeable number, because it can be changed into a prime (20308933) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 48261 + ... + 48679.

It is an arithmetic number, because the mean of its divisors is an integer number (1185030).

Almost surely, 2^20308930 is an apocalyptic number.

20308930 is a deficient number, since it is larger than the sum of its proper divisors (17612030).

20308930 is a wasteful number, since it uses less digits than its factorization.

20308930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20308930 is about 4506.5430209863. The cubic root of 20308930 is about 272.8322351207.

The spelling of 20308930 in words is "twenty million, three hundred eight thousand, nine hundred thirty".