20354011019957 has 2 divisors, whose sum is σ = 20354011019958. Its totient is φ = 20354011019956.

The previous prime is 20354011019897. The next prime is 20354011020019. The reversal of 20354011019957 is 75991011045302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032056680036 + 7321954339921 = 3609994^2 + 2705911^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354011019957 - 2²² = 20354006825653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354011019257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177005509978 + 10177005509979.

It is an arithmetic number, because the mean of its divisors is an integer number (10177005509979).

Almost surely, 2^{20354011019957} is an apocalyptic number.

It is an amenable number.

20354011019957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354011019957 is an equidigital number, since it uses as much as digits as its factorization.

20354011019957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 47.

The spelling of 20354011019957 in words is "twenty trillion, three hundred fifty-four billion, eleven million, nineteen thousand, nine hundred fifty-seven".