20510113345 has 4 divisors (see below), whose sum is σ = 24612136020. Its totient is φ = 16408090672.

The previous prime is 20510113343. The next prime is 20510113373. The reversal of 20510113345 is 54331101502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6695166976 + 13814946369 = 81824^2 + 117537^2 .

It is a cyclic number.

It is not a de Polignac number, because 20510113345 - 2¹ = 20510113343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20510113343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051011330 + ... + 2051011339.

It is an arithmetic number, because the mean of its divisors is an integer number (6153034005).

Almost surely, 2^20510113345 is an apocalyptic number.

It is an amenable number.

20510113345 is a deficient number, since it is larger than the sum of its proper divisors (4102022675).

20510113345 is an equidigital number, since it uses as much as digits as its factorization.

20510113345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4102022674.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20510113345 its reverse (54331101502), we get a palindrome (74841214847).

The spelling of 20510113345 in words is "twenty billion, five hundred ten million, one hundred thirteen thousand, three hundred forty-five".