20495798 has 4 divisors (see below), whose sum is σ = 30743700. Its totient is φ = 10247898.

The previous prime is 20495791. The next prime is 20495801. The reversal of 20495798 is 89759402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89759402 = 2 ⋅44879701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20495791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5123948 + ... + 5123951.

It is an arithmetic number, because the mean of its divisors is an integer number (7685925).

Almost surely, 2^20495798 is an apocalyptic number.

20495798 is a deficient number, since it is larger than the sum of its proper divisors (10247902).

20495798 is a wasteful number, since it uses less digits than its factorization.

20495798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247901.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20495798 is about 4527.2285120148. The cubic root of 20495798 is about 273.6664828663. Note that the first 3 decimals are identical.

The spelling of 20495798 in words is "twenty million, four hundred ninety-five thousand, seven hundred ninety-eight".