20461254389 has 2 divisors, whose sum is σ = 20461254390. Its totient is φ = 20461254388.

The previous prime is 20461254379. The next prime is 20461254409. The reversal of 20461254389 is 98345216402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18945320164 + 1515934225 = 137642^2 + 38935^2 .

It is a cyclic number.

It is not a de Polignac number, because 20461254389 - 2⁸ = 20461254133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20461254379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230627194 + 10230627195.

It is an arithmetic number, because the mean of its divisors is an integer number (10230627195).

Almost surely, 2^20461254389 is an apocalyptic number.

It is an amenable number.

20461254389 is a deficient number, since it is larger than the sum of its proper divisors (1).

20461254389 is an equidigital number, since it uses as much as digits as its factorization.

20461254389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 20461254389 in words is "twenty billion, four hundred sixty-one million, two hundred fifty-four thousand, three hundred eighty-nine".