20508349 has 2 divisors, whose sum is σ = 20508350. Its totient is φ = 20508348.

The previous prime is 20508317. The next prime is 20508379. The reversal of 20508349 is 94380502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18645124 + 1863225 = 4318^2 + 1365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508349 - 2⁵ = 20508317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20508349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20508379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254174 + 10254175.

It is an arithmetic number, because the mean of its divisors is an integer number (10254175).

Almost surely, 2^20508349 is an apocalyptic number.

It is an amenable number.

20508349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508349 is an equidigital number, since it uses as much as digits as its factorization.

20508349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20508349 is about 4528.6144680244. The cubic root of 20508349 is about 273.7223331296.

It can be divided in two parts, 20 and 508349, that added together give a square (508369 = 713²).

The spelling of 20508349 in words is "twenty million, five hundred eight thousand, three hundred forty-nine".