20737815257135 has 4 divisors (see below), whose sum is σ = 24885378308568. Its totient is φ = 16590252205704.

The previous prime is 20737815257111. The next prime is 20737815257153. The reversal of 20737815257135 is 53175251873702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20737815257135 is a prime.

It is a super-2 number, since 2×20737815257135² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073781525709 + ... + 2073781525718.

It is an arithmetic number, because the mean of its divisors is an integer number (6221344577142).

Almost surely, 2^{20737815257135} is an apocalyptic number.

20737815257135 is a deficient number, since it is larger than the sum of its proper divisors (4147563051433).

20737815257135 is an equidigital number, since it uses as much as digits as its factorization.

20737815257135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147563051432.

The product of its (nonzero) digits is 12348000, while the sum is 56.

The spelling of 20737815257135 in words is "twenty trillion, seven hundred thirty-seven billion, eight hundred fifteen million, two hundred fifty-seven thousand, one hundred thirty-five".