20620637 has 2 divisors, whose sum is σ = 20620638. Its totient is φ = 20620636.

The previous prime is 20620619. The next prime is 20620651. The reversal of 20620637 is 73602602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19412836 + 1207801 = 4406^2 + 1099^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620637 - 2⁶ = 20620573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310318 + 10310319.

It is an arithmetic number, because the mean of its divisors is an integer number (10310319).

Almost surely, 2^20620637 is an apocalyptic number.

It is an amenable number.

20620637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620637 is an equidigital number, since it uses as much as digits as its factorization.

20620637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 20620637 is about 4540.9951552496. The cubic root of 20620637 is about 274.2209887137.

The spelling of 20620637 in words is "twenty million, six hundred twenty thousand, six hundred thirty-seven".