20494819 has 8 divisors (see below), whose sum is σ = 20869200. Its totient is φ = 20124000.

The previous prime is 20494807. The next prime is 20494829. The reversal of 20494819 is 91849402.

It is a happy number.

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 20494819 - 2⁹ = 20494307 is a prime.

It is a super-2 number, since 2×20494819² = 840075211685522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20494829) 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, 12457 + ... + 14005.

It is an arithmetic number, because the mean of its divisors is an integer number (2608650).

Almost surely, 2^20494819 is an apocalyptic number.

20494819 is a deficient number, since it is larger than the sum of its proper divisors (374381).

20494819 is a wasteful number, since it uses less digits than its factorization.

20494819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20494819 is about 4527.1203871777. The cubic root of 20494819 is about 273.6621254894.

The spelling of 20494819 in words is "twenty million, four hundred ninety-four thousand, eight hundred nineteen".