20178907242 has 24 divisors (see below), whose sum is σ = 43701067584. Its totient is φ = 6208894224.

The previous prime is 20178907237. The next prime is 20178907277. The reversal of 20178907242 is 24270987102.

It is a junction number, because it is equal to n+sod(n) for n = 20178907194 and 20178907203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9949138 + ... + 9951165.

It is an arithmetic number, because the mean of its divisors is an integer number (1820877816).

Almost surely, 2^20178907242 is an apocalyptic number.

20178907242 is an abundant number, since it is smaller than the sum of its proper divisors (23522160342).

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

20178907242 is a wasteful number, since it uses less digits than its factorization.

20178907242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19900334 (or 19900321 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The spelling of 20178907242 in words is "twenty billion, one hundred seventy-eight million, nine hundred seven thousand, two hundred forty-two".