20308900 has 36 divisors (see below), whose sum is σ = 45104752. Its totient is φ = 7932960.

The previous prime is 20308879. The next prime is 20308901. The reversal of 20308900 is 980302.

It is not an unprimeable number, because it can be changed into a prime (20308901) 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 11 ways as a sum of consecutive naturals, for example, 1939 + ... + 6661.

Almost surely, 2^20308900 is an apocalyptic number.

20308900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20308900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22552376).

20308900 is an abundant number, since it is smaller than the sum of its proper divisors (24795852).

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

20308900 is a wasteful number, since it uses less digits than its factorization.

20308900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20308900 is about 4506.5396924913. The cubic root of 20308900 is about 272.8321007796.

The spelling of 20308900 in words is "twenty million, three hundred eight thousand, nine hundred".