20451312345 has 32 divisors (see below), whose sum is σ = 33779509632. Its totient is φ = 10559388672.

The previous prime is 20451312317. The next prime is 20451312353. The reversal of 20451312345 is 54321315402.

It is not a de Polignac number, because 20451312345 - 2³⁰ = 19377570521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67414 + ... + 213183.

It is an arithmetic number, because the mean of its divisors is an integer number (1055609676).

Almost surely, 2^20451312345 is an apocalyptic number.

It is an amenable number.

20451312345 is a deficient number, since it is larger than the sum of its proper divisors (13328197287).

20451312345 is a wasteful number, since it uses less digits than its factorization.

20451312345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280761.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20451312345 its reverse (54321315402), we get a palindrome (74772627747).

The spelling of 20451312345 in words is "twenty billion, four hundred fifty-one million, three hundred twelve thousand, three hundred forty-five".