20305313155 has 16 divisors (see below), whose sum is σ = 24947977824. Its totient is φ = 15856968960.

The previous prime is 20305313117. The next prime is 20305313183. The reversal of 20305313155 is 55131350302.

It is not a de Polignac number, because 20305313155 - 2⁷ = 20305313027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342577 + ... + 397453.

It is an arithmetic number, because the mean of its divisors is an integer number (1559248614).

Almost surely, 2^20305313155 is an apocalyptic number.

20305313155 is a deficient number, since it is larger than the sum of its proper divisors (4642664669).

20305313155 is a wasteful number, since it uses less digits than its factorization.

20305313155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56646.

The product of its (nonzero) digits is 6750, while the sum is 28.

Adding to 20305313155 its reverse (55131350302), we get a palindrome (75436663457).

The spelling of 20305313155 in words is "twenty billion, three hundred five million, three hundred thirteen thousand, one hundred fifty-five".