20931112949 has 2 divisors, whose sum is σ = 20931112950. Its totient is φ = 20931112948.

The previous prime is 20931112907. The next prime is 20931113011. The reversal of 20931112949 is 94921113902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18603050449 + 2328062500 = 136393^2 + 48250^2 .

It is a cyclic number.

It is not a de Polignac number, because 20931112949 - 2⁸ = 20931112693 is a prime.

It is a super-2 number, since 2×20931112949² (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 (20631112949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10465556474 + 10465556475.

It is an arithmetic number, because the mean of its divisors is an integer number (10465556475).

Almost surely, 2^20931112949 is an apocalyptic number.

It is an amenable number.

20931112949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20931112949 is an equidigital number, since it uses as much as digits as its factorization.

20931112949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 20931112949 in words is "twenty billion, nine hundred thirty-one million, one hundred twelve thousand, nine hundred forty-nine".