20542651 has 2 divisors, whose sum is σ = 20542652. Its totient is φ = 20542650.

The previous prime is 20542649. The next prime is 20542663. The reversal of 20542651 is 15624502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20542651 - 2¹ = 20542649 is a prime.

Together with 20542649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20542051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271325 + 10271326.

It is an arithmetic number, because the mean of its divisors is an integer number (10271326).

Almost surely, 2^20542651 is an apocalyptic number.

20542651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542651 is an equidigital number, since it uses as much as digits as its factorization.

20542651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20542651 is about 4532.4001367929. The cubic root of 20542651 is about 273.8748562730.

The spelling of 20542651 in words is "twenty million, five hundred forty-two thousand, six hundred fifty-one".