20470239 has 40 divisors (see below), whose sum is σ = 32989440. Its totient is φ = 12608784.

The previous prime is 20470237. The next prime is 20470249. The reversal of 20470239 is 93207402.

It is not a de Polignac number, because 20470239 - 2¹ = 20470237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 in 39 ways as a sum of consecutive naturals, for example, 72192 + ... + 72474.

It is an arithmetic number, because the mean of its divisors is an integer number (824736).

Almost surely, 2^20470239 is an apocalyptic number.

20470239 is a deficient number, since it is larger than the sum of its proper divisors (12519201).

20470239 is a wasteful number, since it uses less digits than its factorization.

20470239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20470239 is about 4524.4048227364. The cubic root of 20470239 is about 273.5526782192.

The spelling of 20470239 in words is "twenty million, four hundred seventy thousand, two hundred thirty-nine".