20678813042 has 16 divisors (see below), whose sum is σ = 31200862392. Its totient is φ = 10278696960.

The previous prime is 20678813041. The next prime is 20678813081. The reversal of 20678813042 is 24031887602.

It can be written as a sum of positive squares in 4 ways, for example, as 11489481721 + 9189331321 = 107189^2 + 95861^2 .

It is a super-2 number, since 2×20678813042² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20678813041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200858 + ... + 285834.

Almost surely, 2^20678813042 is an apocalyptic number.

20678813042 is a deficient number, since it is larger than the sum of its proper divisors (10522049350).

20678813042 is a wasteful number, since it uses less digits than its factorization.

20678813042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85693.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 20678813042 in words is "twenty billion, six hundred seventy-eight million, eight hundred thirteen thousand, forty-two".