20305619806 has 32 divisors (see below), whose sum is σ = 31292645760. Its totient is φ = 9878209536.

The previous prime is 20305619797. The next prime is 20305619809. The reversal of 20305619806 is 60891650302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305619809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11964750 + ... + 11966446.

It is an arithmetic number, because the mean of its divisors is an integer number (977895180).

Almost surely, 2^20305619806 is an apocalyptic number.

20305619806 is a deficient number, since it is larger than the sum of its proper divisors (10987025954).

20305619806 is a wasteful number, since it uses less digits than its factorization.

20305619806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628.

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 20305619806 in words is "twenty billion, three hundred five million, six hundred nineteen thousand, eight hundred six".