20474447 has 4 divisors (see below), whose sum is σ = 23399376. Its totient is φ = 17549520.

The previous prime is 20474429. The next prime is 20474449. The reversal of 20474447 is 74447402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74447402 = 2 ⋅37223701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20474447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20474449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462454 + ... + 1462467.

It is an arithmetic number, because the mean of its divisors is an integer number (5849844).

Almost surely, 2^20474447 is an apocalyptic number.

20474447 is a deficient number, since it is larger than the sum of its proper divisors (2924929).

20474447 is an equidigital number, since it uses as much as digits as its factorization.

20474447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924928.

The product of its (nonzero) digits is 25088, while the sum is 32.

The square root of 20474447 is about 4524.8698323819. The cubic root of 20474447 is about 273.5714213777.

The spelling of 20474447 in words is "twenty million, four hundred seventy-four thousand, four hundred forty-seven".