20662451 has 2 divisors, whose sum is σ = 20662452. Its totient is φ = 20662450.

The previous prime is 20662423. The next prime is 20662457. The reversal of 20662451 is 15426602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20662451 - 2¹⁸ = 20400307 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20662451.

It is not a weakly prime, because it can be changed into another prime (20662457) 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, 10331225 + 10331226.

It is an arithmetic number, because the mean of its divisors is an integer number (10331226).

Almost surely, 2^20662451 is an apocalyptic number.

20662451 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662451 is an equidigital number, since it uses as much as digits as its factorization.

20662451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20662451 is about 4545.5968804988. The cubic root of 20662451 is about 274.4062163379.

The spelling of 20662451 in words is "twenty million, six hundred sixty-two thousand, four hundred fifty-one".