20472397 has 8 divisors (see below), whose sum is σ = 22555872. Its totient is φ = 18426000.

The previous prime is 20472379. The next prime is 20472421. The reversal of 20472397 is 79327402.

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 20472397 - 2⁷ = 20472269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20472377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8103 + ... + 10324.

It is an arithmetic number, because the mean of its divisors is an integer number (2819484).

Almost surely, 2^20472397 is an apocalyptic number.

It is an amenable number.

20472397 is a deficient number, since it is larger than the sum of its proper divisors (2083475).

20472397 is a wasteful number, since it uses less digits than its factorization.

20472397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18539.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 20472397 is about 4524.6433008581. The cubic root of 20472397 is about 273.5622906446.

Adding to 20472397 its reverse (79327402), we get a palindrome (99799799).

It can be divided in two parts, 2047 and 2397, that added together give a palindrome (4444).

The spelling of 20472397 in words is "twenty million, four hundred seventy-two thousand, three hundred ninety-seven".