20943438157 has 2 divisors, whose sum is σ = 20943438158. Its totient is φ = 20943438156.

The previous prime is 20943438121. The next prime is 20943438221. The reversal of 20943438157 is 75183434902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17283309156 + 3660129001 = 131466^2 + 60499^2 .

It is a cyclic number.

It is not a de Polignac number, because 20943438157 - 2³¹ = 18795954509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20943438557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10471719078 + 10471719079.

It is an arithmetic number, because the mean of its divisors is an integer number (10471719079).

Almost surely, 2^20943438157 is an apocalyptic number.

It is an amenable number.

20943438157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20943438157 is an equidigital number, since it uses as much as digits as its factorization.

20943438157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 46.

It can be divided in two parts, 2094343 and 8157, that added together give a square (2102500 = 1450²).

The spelling of 20943438157 in words is "twenty billion, nine hundred forty-three million, four hundred thirty-eight thousand, one hundred fifty-seven".