20431155145 has 8 divisors (see below), whose sum is σ = 25807775040. Its totient is φ = 15484664880.

The previous prime is 20431155131. The next prime is 20431155161. The reversal of 20431155145 is 54155113402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20431155145 - 2¹¹ = 20431153097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107532301 + ... + 107532490.

It is an arithmetic number, because the mean of its divisors is an integer number (3225971880).

Almost surely, 2^20431155145 is an apocalyptic number.

It is an amenable number.

20431155145 is a deficient number, since it is larger than the sum of its proper divisors (5376619895).

20431155145 is a wasteful number, since it uses less digits than its factorization.

20431155145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215064815.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 20431155145 its reverse (54155113402), we get a palindrome (74586268547).

The spelling of 20431155145 in words is "twenty billion, four hundred thirty-one million, one hundred fifty-five thousand, one hundred forty-five".