20654993 has 2 divisors, whose sum is σ = 20654994. Its totient is φ = 20654992.

The previous prime is 20654951. The next prime is 20654999. The reversal of 20654993 is 39945602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 332929 = 4508^2 + 577^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20654993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20654999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327496 + 10327497.

It is an arithmetic number, because the mean of its divisors is an integer number (10327497).

Almost surely, 2^20654993 is an apocalyptic number.

It is an amenable number.

20654993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654993 is an equidigital number, since it uses as much as digits as its factorization.

20654993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 20654993 is about 4544.7764521481. The cubic root of 20654993 is about 274.3731972180.

The spelling of 20654993 in words is "twenty million, six hundred fifty-four thousand, nine hundred ninety-three".