20703553 has 4 divisors (see below), whose sum is σ = 22296148. Its totient is φ = 19110960.

The previous prime is 20703541. The next prime is 20703563. The reversal of 20703553 is 35530702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35530702 = 2 ⋅17765351.

It can be written as a sum of positive squares in 2 ways, for example, as 7219969 + 13483584 = 2687^2 + 3672^2 .

It is a cyclic number.

It is not a de Polignac number, because 20703553 - 2¹³ = 20695361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20703503) 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 in 3 ways as a sum of consecutive naturals, for example, 796278 + ... + 796303.

It is an arithmetic number, because the mean of its divisors is an integer number (5574037).

Almost surely, 2^20703553 is an apocalyptic number.

It is an amenable number.

20703553 is a deficient number, since it is larger than the sum of its proper divisors (1592595).

20703553 is a wasteful number, since it uses less digits than its factorization.

20703553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592594.

The product of its (nonzero) digits is 3150, while the sum is 25.

The square root of 20703553 is about 4550.1157128143. The cubic root of 20703553 is about 274.5880465576.

The spelling of 20703553 in words is "twenty million, seven hundred three thousand, five hundred fifty-three".