20654143 has 2 divisors, whose sum is σ = 20654144. Its totient is φ = 20654142.

The previous prime is 20654107. The next prime is 20654171. The reversal of 20654143 is 34145602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20654143 - 2²¹ = 18556991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20654243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10327071 + 10327072.

It is an arithmetic number, because the mean of its divisors is an integer number (10327072).

Almost surely, 2^20654143 is an apocalyptic number.

20654143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20654143 is an equidigital number, since it uses as much as digits as its factorization.

20654143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20654143 is about 4544.6829372356. The cubic root of 20654143 is about 274.3694334724.

Adding to 20654143 its reverse (34145602), we get a palindrome (54799745).

The spelling of 20654143 in words is "twenty million, six hundred fifty-four thousand, one hundred forty-three".