20431451121545 has 12 divisors (see below), whose sum is σ = 24989068537356. Its totient is φ = 16036761624000.

The previous prime is 20431451121451. The next prime is 20431451121589. The reversal of 20431451121545 is 54512115413402.

It can be written as a sum of positive squares in 6 ways, for example, as 826959253129 + 19604491868416 = 909373^2 + 4427696^2 .

It is not a de Polignac number, because 20431451121545 - 2¹² = 20431451117449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20431451121499 and 20431451121508.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 727342706 + ... + 727370795.

It is an arithmetic number, because the mean of its divisors is an integer number (2082422378113).

Almost surely, 2^{20431451121545} is an apocalyptic number.

It is an amenable number.

20431451121545 is a deficient number, since it is larger than the sum of its proper divisors (4557617415811).

20431451121545 is an equidigital number, since it uses as much as digits as its factorization.

20431451121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454713612 (or 1454713559 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

Adding to 20431451121545 its reverse (54512115413402), we get a palindrome (74943566534947).

The spelling of 20431451121545 in words is "twenty trillion, four hundred thirty-one billion, four hundred fifty-one million, one hundred twenty-one thousand, five hundred forty-five".