20954081873 has 2 divisors, whose sum is σ = 20954081874. Its totient is φ = 20954081872.

The previous prime is 20954081861. The next prime is 20954081891. The reversal of 20954081873 is 37818045902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11531108689 + 9422973184 = 107383^2 + 97072^2 .

It is a cyclic number.

It is not a de Polignac number, because 20954081873 - 2²⁸ = 20685646417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20954081803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10477040936 + 10477040937.

It is an arithmetic number, because the mean of its divisors is an integer number (10477040937).

Almost surely, 2^20954081873 is an apocalyptic number.

It is an amenable number.

20954081873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20954081873 is an equidigital number, since it uses as much as digits as its factorization.

20954081873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20954081873 in words is "twenty billion, nine hundred fifty-four million, eighty-one thousand, eight hundred seventy-three".