20135494370778 has 32 divisors (see below), whose sum is σ = 40279567569792. Its totient is φ = 6710401843200.

The previous prime is 20135494370773. The next prime is 20135494370819. The reversal of 20135494370778 is 87707349453102.

It is a super-2 number, since 2×20135494370778² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20135494370773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 873886938 + ... + 873909978.

It is an arithmetic number, because the mean of its divisors is an integer number (1258736486556).

Almost surely, 2^{20135494370778} is an apocalyptic number.

20135494370778 is an abundant number, since it is smaller than the sum of its proper divisors (20144073199014).

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

20135494370778 is a wasteful number, since it uses less digits than its factorization.

20135494370778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47750.

The product of its (nonzero) digits is 35562240, while the sum is 60.

The spelling of 20135494370778 in words is "twenty trillion, one hundred thirty-five billion, four hundred ninety-four million, three hundred seventy thousand, seven hundred seventy-eight".