20690063 has 4 divisors (see below), whose sum is σ = 20699448. Its totient is φ = 20680680.

The previous prime is 20690057. The next prime is 20690077. The reversal of 20690063 is 36009602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36009602 = 2 ⋅18004801.

It is a cyclic number.

It is not a de Polignac number, because 20690063 - 2⁸ = 20689807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20690023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (5174862).

Almost surely, 2^20690063 is an apocalyptic number.

20690063 is a deficient number, since it is larger than the sum of its proper divisors (9385).

20690063 is an equidigital number, since it uses as much as digits as its factorization.

20690063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9384.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 20690063 is about 4548.6330913803. The cubic root of 20690063 is about 274.5283949998.

Adding to 20690063 its reverse (36009602), we get a palindrome (56699665).

The spelling of 20690063 in words is "twenty million, six hundred ninety thousand, sixty-three".