20892491 has 2 divisors, whose sum is σ = 20892492. Its totient is φ = 20892490.

The previous prime is 20892463. The next prime is 20892497. The reversal of 20892491 is 19429802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20892491 - 2⁶ = 20892427 is a prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is not a weakly prime, because it can be changed into another prime (20892497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10446245 + 10446246.

It is an arithmetic number, because the mean of its divisors is an integer number (10446246).

Almost surely, 2^20892491 is an apocalyptic number.

20892491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20892491 is an equidigital number, since it uses as much as digits as its factorization.

20892491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 20892491 is about 4570.8304497104. The cubic root of 20892491 is about 275.4208036936.

The spelling of 20892491 in words is "twenty million, eight hundred ninety-two thousand, four hundred ninety-one".