20620973 has 2 divisors, whose sum is σ = 20620974. Its totient is φ = 20620972.

The previous prime is 20620961. The next prime is 20620981. The reversal of 20620973 is 37902602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 2617924 = 4243^2 + 1618^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620973 - 2¹⁴ = 20604589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310486 + 10310487.

It is an arithmetic number, because the mean of its divisors is an integer number (10310487).

Almost surely, 2^20620973 is an apocalyptic number.

It is an amenable number.

20620973 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620973 is an equidigital number, since it uses as much as digits as its factorization.

20620973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 20620973 is about 4541.0321513947. The cubic root of 20620973 is about 274.2224781237. Note that the first 3 decimals are identical.

The spelling of 20620973 in words is "twenty million, six hundred twenty thousand, nine hundred seventy-three".