20193154843 has 2 divisors, whose sum is σ = 20193154844. Its totient is φ = 20193154842.

The previous prime is 20193154769. The next prime is 20193154903. The reversal of 20193154843 is 34845139102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20193154843 - 2¹⁷ = 20193023771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20193154796 and 20193154805.

It is not a weakly prime, because it can be changed into another prime (20193154043) 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, 10096577421 + 10096577422.

It is an arithmetic number, because the mean of its divisors is an integer number (10096577422).

Almost surely, 2^20193154843 is an apocalyptic number.

20193154843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20193154843 is an equidigital number, since it uses as much as digits as its factorization.

20193154843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20193154843 in words is "twenty billion, one hundred ninety-three million, one hundred fifty-four thousand, eight hundred forty-three".