20479908155 has 16 divisors (see below), whose sum is σ = 28771775424. Its totient is φ = 13700843520.

The previous prime is 20479908149. The next prime is 20479908167. The reversal of 20479908155 is 55180997402.

It is not a de Polignac number, because 20479908155 - 2⁶ = 20479908091 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7134422 + ... + 7137291.

It is an arithmetic number, because the mean of its divisors is an integer number (1798235964).

Almost surely, 2^20479908155 is an apocalyptic number.

20479908155 is a deficient number, since it is larger than the sum of its proper divisors (8291867269).

20479908155 is a wasteful number, since it uses less digits than its factorization.

20479908155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14271766.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 20479908155 in words is "twenty billion, four hundred seventy-nine million, nine hundred eight thousand, one hundred fifty-five".