20490443 has 8 divisors (see below), whose sum is σ = 21489600. Its totient is φ = 19510848.

The previous prime is 20490439. The next prime is 20490451. The reversal of 20490443 is 34409402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20490443 - 2² = 20490439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20490413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723 + ... + 6956.

It is an arithmetic number, because the mean of its divisors is an integer number (2686200).

Almost surely, 2^20490443 is an apocalyptic number.

20490443 is a deficient number, since it is larger than the sum of its proper divisors (999157).

20490443 is an equidigital number, since it uses as much as digits as its factorization.

20490443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9781.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20490443 is about 4526.6370519404. The cubic root of 20490443 is about 273.6426468965.

Adding to 20490443 its reverse (34409402), we get a palindrome (54899845).

The spelling of 20490443 in words is "twenty million, four hundred ninety thousand, four hundred forty-three".