20506562113 has 8 divisors (see below), whose sum is σ = 20723956488. Its totient is φ = 20289798144.

The previous prime is 20506562107. The next prime is 20506562119. The reversal of 20506562113 is 31126560502.

It is an interprime number because it is at equal distance from previous prime (20506562107) and next prime (20506562119).

It can be written as a sum of positive squares in 4 ways, for example, as 2441051649 + 18065510464 = 49407^2 + 134408^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20506562113 - 2²¹ = 20504464961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20506562119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92056 + ... + 222457.

It is an arithmetic number, because the mean of its divisors is an integer number (2590494561).

Almost surely, 2^20506562113 is an apocalyptic number.

It is an amenable number.

20506562113 is a deficient number, since it is larger than the sum of its proper divisors (217394375).

20506562113 is a wasteful number, since it uses less digits than its factorization.

20506562113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315203.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20506562113 in words is "twenty billion, five hundred six million, five hundred sixty-two thousand, one hundred thirteen".