20978094031 has 2 divisors, whose sum is σ = 20978094032. Its totient is φ = 20978094030.

The previous prime is 20978094019. The next prime is 20978094073. The reversal of 20978094031 is 13049087902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20978094031 - 2⁵ = 20978093999 is a prime.

It is a super-2 number, since 2×20978094031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20978094131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489047015 + 10489047016.

It is an arithmetic number, because the mean of its divisors is an integer number (10489047016).

Almost surely, 2^20978094031 is an apocalyptic number.

20978094031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20978094031 is an equidigital number, since it uses as much as digits as its factorization.

20978094031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 20978094031 in words is "twenty billion, nine hundred seventy-eight million, ninety-four thousand, thirty-one".