20431535025545 has 64 divisors (see below), whose sum is σ = 28201506600960. Its totient is φ = 13919980032000.

The previous prime is 20431535025541. The next prime is 20431535025563. The reversal of 20431535025545 is 54552053513402.

It is not a de Polignac number, because 20431535025545 - 2² = 20431535025541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20431535025496 and 20431535025505.

It is not an unprimeable number, because it can be changed into a prime (20431535025541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8957269805 + ... + 8957272085.

It is an arithmetic number, because the mean of its divisors is an integer number (440648540640).

Almost surely, 2^{20431535025545} is an apocalyptic number.

It is an amenable number.

20431535025545 is a deficient number, since it is larger than the sum of its proper divisors (7769971575415).

20431535025545 is a wasteful number, since it uses less digits than its factorization.

20431535025545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746.

The product of its (nonzero) digits is 1800000, while the sum is 44.

Adding to 20431535025545 its reverse (54552053513402), we get a palindrome (74983588538947).

The spelling of 20431535025545 in words is "twenty trillion, four hundred thirty-one billion, five hundred thirty-five million, twenty-five thousand, five hundred forty-five".