20472371 has 4 divisors (see below), whose sum is σ = 20562000. Its totient is φ = 20382744.

The previous prime is 20472349. The next prime is 20472377. The reversal of 20472371 is 17327402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17327402 = 2 ⋅8663701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20472371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20472371.

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 3 ways as a sum of consecutive naturals, for example, 44471 + ... + 44928.

It is an arithmetic number, because the mean of its divisors is an integer number (5140500).

Almost surely, 2^20472371 is an apocalyptic number.

20472371 is a deficient number, since it is larger than the sum of its proper divisors (89629).

20472371 is an equidigital number, since it uses as much as digits as its factorization.

20472371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89628.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 20472371 is about 4524.6404277025. The cubic root of 20472371 is about 273.5621748363.

Adding to 20472371 its reverse (17327402), we get a palindrome (37799773).

The spelling of 20472371 in words is "twenty million, four hundred seventy-two thousand, three hundred seventy-one".