20715349 has 2 divisors, whose sum is σ = 20715350. Its totient is φ = 20715348.

The previous prime is 20715337. The next prime is 20715407. The reversal of 20715349 is 94351702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 734449 = 4470^2 + 857^2 .

It is a cyclic number.

It is not a de Polignac number, because 20715349 - 2⁷ = 20715221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20715349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20715319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10357674 + 10357675.

It is an arithmetic number, because the mean of its divisors is an integer number (10357675).

Almost surely, 2^20715349 is an apocalyptic number.

It is an amenable number.

20715349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20715349 is an equidigital number, since it uses as much as digits as its factorization.

20715349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20715349 is about 4551.4117590040. The cubic root of 20715349 is about 274.6401861692.

The spelling of 20715349 in words is "twenty million, seven hundred fifteen thousand, three hundred forty-nine".