20495738 has 4 divisors (see below), whose sum is σ = 30743610. Its totient is φ = 10247868.

The previous prime is 20495731. The next prime is 20495749. The reversal of 20495738 is 83759402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83759402 = 2 ⋅41879701.

It can be written as a sum of positive squares in only one way, i.e., 14845609 + 5650129 = 3853^2 + 2377^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20495731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5123933 + ... + 5123936.

Almost surely, 2^20495738 is an apocalyptic number.

20495738 is a deficient number, since it is larger than the sum of its proper divisors (10247872).

20495738 is a wasteful number, since it uses less digits than its factorization.

20495738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10247871.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 20495738 is about 4527.2218854392. The cubic root of 20495738 is about 273.6662158196. Note that the first 3 decimals are identical.

The spelling of 20495738 in words is "twenty million, four hundred ninety-five thousand, seven hundred thirty-eight".