20138603305 has 8 divisors (see below), whose sum is σ = 24184964232. Its totient is φ = 16098455808.

The previous prime is 20138603297. The next prime is 20138603311. The reversal of 20138603305 is 50330683102.

It can be written as a sum of positive squares in 4 ways, for example, as 5832529641 + 14306073664 = 76371^2 + 119608^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20138603305 - 2³ = 20138603297 is a prime.

It is a Duffinian number.

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, 1546222 + ... + 1559191.

It is an arithmetic number, because the mean of its divisors is an integer number (3023120529).

Almost surely, 2^20138603305 is an apocalyptic number.

It is an amenable number.

20138603305 is a deficient number, since it is larger than the sum of its proper divisors (4046360927).

20138603305 is a wasteful number, since it uses less digits than its factorization.

20138603305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106715.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 20138603305 in words is "twenty billion, one hundred thirty-eight million, six hundred three thousand, three hundred five".