20035400557 has 2 divisors, whose sum is σ = 20035400558. Its totient is φ = 20035400556.

The previous prime is 20035400513. The next prime is 20035400591. The reversal of 20035400557 is 75500453002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14449482436 + 5585918121 = 120206^2 + 74739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20035400557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20035401557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10017700278 + 10017700279.

It is an arithmetic number, because the mean of its divisors is an integer number (10017700279).

Almost surely, 2^20035400557 is an apocalyptic number.

It is an amenable number.

20035400557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20035400557 is an equidigital number, since it uses as much as digits as its factorization.

20035400557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 31.

Adding to 20035400557 its reverse (75500453002), we get a palindrome (95535853559).

The spelling of 20035400557 in words is "twenty billion, thirty-five million, four hundred thousand, five hundred fifty-seven".