20513356435461 has 4 divisors (see below), whose sum is σ = 27351141913952. Its totient is φ = 13675570956972.

The previous prime is 20513356435459. The next prime is 20513356435463. The reversal of 20513356435461 is 16453465331502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20513356435459) and next prime (20513356435463).

It is not a de Polignac number, because 20513356435461 - 2¹ = 20513356435459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20513356435461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513356435463) 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, 3418892739241 + ... + 3418892739246.

It is an arithmetic number, because the mean of its divisors is an integer number (6837785478488).

Almost surely, 2^{20513356435461} is an apocalyptic number.

It is an amenable number.

20513356435461 is a deficient number, since it is larger than the sum of its proper divisors (6837785478491).

20513356435461 is an equidigital number, since it uses as much as digits as its factorization.

20513356435461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837785478490.

The product of its (nonzero) digits is 3888000, while the sum is 48.

The spelling of 20513356435461 in words is "twenty trillion, five hundred thirteen billion, three hundred fifty-six million, four hundred thirty-five thousand, four hundred sixty-one".