20609773 has 2 divisors, whose sum is σ = 20609774. Its totient is φ = 20609772.

The previous prime is 20609753. The next prime is 20609779. The reversal of 20609773 is 37790602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14122564 + 6487209 = 3758^2 + 2547^2 .

It is a cyclic number.

It is not a de Polignac number, because 20609773 - 2⁹ = 20609261 is a prime.

It is a super-2 number, since 2×20609773² = 849525486223058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20609779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10304886 + 10304887.

It is an arithmetic number, because the mean of its divisors is an integer number (10304887).

Almost surely, 2^20609773 is an apocalyptic number.

It is an amenable number.

20609773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20609773 is an equidigital number, since it uses as much as digits as its factorization.

20609773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20609773 is about 4539.7987840872. The cubic root of 20609773 is about 274.1728224008.

The spelling of 20609773 in words is "twenty million, six hundred nine thousand, seven hundred seventy-three".