20078931 has 8 divisors (see below), whose sum is σ = 27936000. Its totient is φ = 12803912.

The previous prime is 20078897. The next prime is 20078941. The reversal of 20078931 is 13987002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20078931 - 2⁶ = 20078867 is a prime.

It is a super-2 number, since 2×20078931² = 806326940205522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20078941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145431 + ... + 145568.

It is an arithmetic number, because the mean of its divisors is an integer number (3492000).

Almost surely, 2^20078931 is an apocalyptic number.

20078931 is a deficient number, since it is larger than the sum of its proper divisors (7857069).

20078931 is a wasteful number, since it uses less digits than its factorization.

20078931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291025.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 20078931 is about 4480.9520193816. The cubic root of 20078931 is about 271.7983790954.

The spelling of 20078931 in words is "twenty million, seventy-eight thousand, nine hundred thirty-one".