20040343789 has 2 divisors, whose sum is σ = 20040343790. Its totient is φ = 20040343788.

The previous prime is 20040343783. The next prime is 20040343823. The reversal of 20040343789 is 98734304002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18128468164 + 1911875625 = 134642^2 + 43725^2 .

It is a cyclic number.

It is not a de Polignac number, because 20040343789 - 2²⁷ = 19906126061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20040343783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020171894 + 10020171895.

It is an arithmetic number, because the mean of its divisors is an integer number (10020171895).

Almost surely, 2^20040343789 is an apocalyptic number.

It is an amenable number.

20040343789 is a deficient number, since it is larger than the sum of its proper divisors (1).

20040343789 is an equidigital number, since it uses as much as digits as its factorization.

20040343789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 20040343789 in words is "twenty billion, forty million, three hundred forty-three thousand, seven hundred eighty-nine".