20136537335442 has 64 divisors (see below), whose sum is σ = 45015725801088. Its totient is φ = 5951843328000.

The previous prime is 20136537335419. The next prime is 20136537335449. The reversal of 20136537335442 is 24453373563102.

It is a junction number, because it is equal to n+sod(n) for n = 20136537335391 and 20136537335400.

It is not an unprimeable number, because it can be changed into a prime (20136537335449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11526298 + ... + 13157834.

It is an arithmetic number, because the mean of its divisors is an integer number (703370715642).

Almost surely, 2^{20136537335442} is an apocalyptic number.

20136537335442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20136537335442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22507862900544).

20136537335442 is an abundant number, since it is smaller than the sum of its proper divisors (24879188465646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20136537335442 is a wasteful number, since it uses less digits than its factorization.

20136537335442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636155.

The product of its (nonzero) digits is 5443200, while the sum is 48.

The spelling of 20136537335442 in words is "twenty trillion, one hundred thirty-six billion, five hundred thirty-seven million, three hundred thirty-five thousand, four hundred forty-two".