20450493 has 36 divisors (see below), whose sum is σ = 34856640. Its totient is φ = 11518416.

The previous prime is 20450491. The next prime is 20450531. The reversal of 20450493 is 39405402.

It is not a de Polignac number, because 20450493 - 2¹ = 20450491 is a prime.

It is a zygodrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450491) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 34546 + ... + 35132.

It is an arithmetic number, because the mean of its divisors is an integer number (968240).

Almost surely, 2^20450493 is an apocalyptic number.

It is an amenable number.

20450493 is a deficient number, since it is larger than the sum of its proper divisors (14406147).

20450493 is a wasteful number, since it uses less digits than its factorization.

20450493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20450493 is about 4522.2221307671. Note that the first 3 decimals coincide. The cubic root of 20450493 is about 273.4646918025.

Adding to 20450493 its reverse (39405402), we get a palindrome (59855895).

The spelling of 20450493 in words is "twenty million, four hundred fifty thousand, four hundred ninety-three".