20465491 has 2 divisors, whose sum is σ = 20465492. Its totient is φ = 20465490.

The previous prime is 20465449. The next prime is 20465509. The reversal of 20465491 is 19456402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20465491 - 2⁹ = 20464979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20465411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232745 + 10232746.

It is an arithmetic number, because the mean of its divisors is an integer number (10232746).

Almost surely, 2^20465491 is an apocalyptic number.

20465491 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465491 is an equidigital number, since it uses as much as digits as its factorization.

20465491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20465491 is about 4523.8800824071. The cubic root of 20465491 is about 273.5315267230.

The spelling of 20465491 in words is "twenty million, four hundred sixty-five thousand, four hundred ninety-one".