20472396 has 72 divisors (see below), whose sum is σ = 57130416. Its totient is φ = 5685120.

The previous prime is 20472379. The next prime is 20472421. The reversal of 20472396 is 69327402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21286 + ... + 22226.

It is an arithmetic number, because the mean of its divisors is an integer number (793478).

Almost surely, 2^20472396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20472396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28565208).

20472396 is an abundant number, since it is smaller than the sum of its proper divisors (36658020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20472396 is a wasteful number, since it uses less digits than its factorization.

20472396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 20472396 is about 4524.6431903521. The cubic root of 20472396 is about 273.5622861905.

Adding to 20472396 its reverse (69327402), we get a palindrome (89799798).

The spelling of 20472396 in words is "twenty million, four hundred seventy-two thousand, three hundred ninety-six".