20550121154 has 16 divisors (see below), whose sum is σ = 31824126720. Its totient is φ = 9942174480.

The previous prime is 20550121153. The next prime is 20550121183. The reversal of 20550121154 is 45112105502.

It is not an unprimeable number, because it can be changed into a prime (20550121153) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 502937 + ... + 542259.

It is an arithmetic number, because the mean of its divisors is an integer number (1989007920).

Almost surely, 2^20550121154 is an apocalyptic number.

20550121154 is a deficient number, since it is larger than the sum of its proper divisors (11274005566).

20550121154 is a wasteful number, since it uses less digits than its factorization.

20550121154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47785.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 20550121154 its reverse (45112105502), we get a palindrome (65662226656).

The spelling of 20550121154 in words is "twenty billion, five hundred fifty million, one hundred twenty-one thousand, one hundred fifty-four".