20840380306 has 4 divisors (see below), whose sum is σ = 31260570462. Its totient is φ = 10420190152.

The previous prime is 20840380303. The next prime is 20840380333. The reversal of 20840380306 is 60308304802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17770223025 + 3070157281 = 133305^2 + 55409^2 .

It is not an unprimeable number, because it can be changed into a prime (20840380303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5210095075 + ... + 5210095078.

Almost surely, 2^20840380306 is an apocalyptic number.

20840380306 is a deficient number, since it is larger than the sum of its proper divisors (10420190156).

20840380306 is a wasteful number, since it uses less digits than its factorization.

20840380306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420190155.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 20840380306 in words is "twenty billion, eight hundred forty million, three hundred eighty thousand, three hundred six".