20635122878 has 4 divisors (see below), whose sum is σ = 30952684320. Its totient is φ = 10317561438.

The previous prime is 20635122877. The next prime is 20635122917. The reversal of 20635122878 is 87822153602.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20635122877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5158780718 + ... + 5158780721.

It is an arithmetic number, because the mean of its divisors is an integer number (7738171080).

Almost surely, 2^20635122878 is an apocalyptic number.

20635122878 is a deficient number, since it is larger than the sum of its proper divisors (10317561442).

20635122878 is a wasteful number, since it uses less digits than its factorization.

20635122878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10317561441.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 20635122878 in words is "twenty billion, six hundred thirty-five million, one hundred twenty-two thousand, eight hundred seventy-eight".