20735557 has 2 divisors, whose sum is σ = 20735558. Its totient is φ = 20735556.

The previous prime is 20735537. The next prime is 20735567. The reversal of 20735557 is 75553702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 1252161 = 4414^2 + 1119^2 .

It is a cyclic number.

It is not a de Polignac number, because 20735557 - 2¹⁵ = 20702789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20735537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10367778 + 10367779.

It is an arithmetic number, because the mean of its divisors is an integer number (10367779).

Almost surely, 2^20735557 is an apocalyptic number.

It is an amenable number.

20735557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20735557 is an equidigital number, since it uses as much as digits as its factorization.

20735557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36750, while the sum is 34.

The square root of 20735557 is about 4553.6311884034. The cubic root of 20735557 is about 274.7294617621.

The spelling of 20735557 in words is "twenty million, seven hundred thirty-five thousand, five hundred fifty-seven".