20531211154 has 32 divisors (see below), whose sum is σ = 31993823232. Its totient is φ = 9871050000.

The previous prime is 20531211143. The next prime is 20531211157. The reversal of 20531211154 is 45111213502.

It is not an unprimeable number, because it can be changed into a prime (20531211157) 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 15 ways as a sum of consecutive naturals, for example, 7639599 + ... + 7642285.

It is an arithmetic number, because the mean of its divisors is an integer number (999806976).

Almost surely, 2^20531211154 is an apocalyptic number.

20531211154 is a deficient number, since it is larger than the sum of its proper divisors (11462612078).

20531211154 is a wasteful number, since it uses less digits than its factorization.

20531211154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20531211154 its reverse (45111213502), we get a palindrome (65642424656).

The spelling of 20531211154 in words is "twenty billion, five hundred thirty-one million, two hundred eleven thousand, one hundred fifty-four".