20470238 has 4 divisors (see below), whose sum is σ = 30705360. Its totient is φ = 10235118.

The previous prime is 20470237. The next prime is 20470249. The reversal of 20470238 is 83207402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83207402 = 2 ⋅41603701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20470237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5117558 + ... + 5117561.

It is an arithmetic number, because the mean of its divisors is an integer number (7676340).

Almost surely, 2^20470238 is an apocalyptic number.

20470238 is a deficient number, since it is larger than the sum of its proper divisors (10235122).

20470238 is a wasteful number, since it uses less digits than its factorization.

20470238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10235121.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20470238 is about 4524.4047122246. The cubic root of 20470238 is about 273.5526737647.

The spelling of 20470238 in words is "twenty million, four hundred seventy thousand, two hundred thirty-eight".