20203120155 has 16 divisors (see below), whose sum is σ = 32416572960. Its totient is φ = 10744470528.

The previous prime is 20203120123. The next prime is 20203120181. The reversal of 20203120155 is 55102130202.

It is not a de Polignac number, because 20203120155 - 2⁵ = 20203120123 is a prime.

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, 1902460 + ... + 1913049.

It is an arithmetic number, because the mean of its divisors is an integer number (2026035810).

Almost surely, 2^20203120155 is an apocalyptic number.

20203120155 is a deficient number, since it is larger than the sum of its proper divisors (12213452805).

20203120155 is a wasteful number, since it uses less digits than its factorization.

20203120155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815870.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 20203120155 its reverse (55102130202), we get a palindrome (75305250357).

The spelling of 20203120155 in words is "twenty billion, two hundred three million, one hundred twenty thousand, one hundred fifty-five".