20535402605131 has 4 divisors (see below), whose sum is σ = 21197834947264. Its totient is φ = 19872970263000.

The previous prime is 20535402605129. The next prime is 20535402605141. The reversal of 20535402605131 is 13150620453502.

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

It is a cyclic number.

It is not a de Polignac number, because 20535402605131 - 2¹ = 20535402605129 is a prime.

It is a super-2 number, since 2×20535402605131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20535402605141) 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, 331216171020 + ... + 331216171081.

It is an arithmetic number, because the mean of its divisors is an integer number (5299458736816).

Almost surely, 2^{20535402605131} is an apocalyptic number.

20535402605131 is a deficient number, since it is larger than the sum of its proper divisors (662432342133).

20535402605131 is an equidigital number, since it uses as much as digits as its factorization.

20535402605131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662432342132.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20535402605131 in words is "twenty trillion, five hundred thirty-five billion, four hundred two million, six hundred five thousand, one hundred thirty-one".