20620783 has 2 divisors, whose sum is σ = 20620784. Its totient is φ = 20620782.

The previous prime is 20620777. The next prime is 20620793. The reversal of 20620783 is 38702602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20620783 - 2⁵ = 20620751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310391 + 10310392.

It is an arithmetic number, because the mean of its divisors is an integer number (10310392).

Almost surely, 2^20620783 is an apocalyptic number.

20620783 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620783 is an equidigital number, since it uses as much as digits as its factorization.

20620783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20620783 is about 4541.0112309925. The cubic root of 20620783 is about 274.2216358998.

The spelling of 20620783 in words is "twenty million, six hundred twenty thousand, seven hundred eighty-three".