20890644373 has 2 divisors, whose sum is σ = 20890644374. Its totient is φ = 20890644372.

The previous prime is 20890644331. The next prime is 20890644431. The reversal of 20890644373 is 37344609802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15005760004 + 5884884369 = 122498^2 + 76713^2 .

It is a cyclic number.

It is not a de Polignac number, because 20890644373 - 2²¹ = 20888547221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20890624373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445322186 + 10445322187.

It is an arithmetic number, because the mean of its divisors is an integer number (10445322187).

Almost surely, 2^20890644373 is an apocalyptic number.

It is an amenable number.

20890644373 is a deficient number, since it is larger than the sum of its proper divisors (1).

20890644373 is an equidigital number, since it uses as much as digits as its factorization.

20890644373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 20890644373 in words is "twenty billion, eight hundred ninety million, six hundred forty-four thousand, three hundred seventy-three".