20034557 has 2 divisors, whose sum is σ = 20034558. Its totient is φ = 20034556.

The previous prime is 20034533. The next prime is 20034589. The reversal of 20034557 is 75543002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 89401 = 4466^2 + 299^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20034557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20034257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10017278 + 10017279.

It is an arithmetic number, because the mean of its divisors is an integer number (10017279).

Almost surely, 2^20034557 is an apocalyptic number.

It is an amenable number.

20034557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20034557 is an equidigital number, since it uses as much as digits as its factorization.

20034557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20034557 is about 4475.9978775688. The cubic root of 20034557 is about 271.5980085862.

Adding to 20034557 its reverse (75543002), we get a palindrome (95577559).

The spelling of 20034557 in words is "twenty million, thirty-four thousand, five hundred fifty-seven".