20402291057 has 2 divisors, whose sum is σ = 20402291058. Its totient is φ = 20402291056.

The previous prime is 20402290999. The next prime is 20402291083. The reversal of 20402291057 is 75019220402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17782489201 + 2619801856 = 133351^2 + 51184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402291057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402291087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201145528 + 10201145529.

It is an arithmetic number, because the mean of its divisors is an integer number (10201145529).

Almost surely, 2^20402291057 is an apocalyptic number.

It is an amenable number.

20402291057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402291057 is an equidigital number, since it uses as much as digits as its factorization.

20402291057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 20402291057 in words is "twenty billion, four hundred two million, two hundred ninety-one thousand, fifty-seven".